---

SECTION B - ESSAY ANSWERS

---

Q1. Shoulder Joint Dislocation (30-year-old male, fall on right shoulder)

a) Identify the Cause

---

b) Ligaments and Muscles Supporting the Joint

---

c) Movements With Muscles Involved

---

d) Applied Aspects

1. Anterior dislocation (most common) - humeral head moves anteroinferiorly; the normal rounded contour is lost and there is a "squared-off" appearance of the shoulder. The arm is held in abduction and external rotation.
2. Axillary nerve injury - the axillary nerve winds around the surgical neck of humerus. In anterior dislocation, the nerve can be stretched, leading to loss of deltoid function (abduction impaired) + sensory loss over the "regimental badge" area (lateral arm).
3. Bankart lesion - avulsion of the anteroinferior glenoid labrum; predisposes to recurrent dislocations.
4. Hill-Sachs lesion - compression fracture of the posterosuperior humeral head caused by impaction against the glenoid rim.
5. Recurrent dislocation - caused by capsular laxity or bony defects; treated with Bankart repair arthroscopically.
6. Rotator cuff tear - particularly supraspinatus, may accompany dislocation in elderly patients.

---

Q2. Varicose Veins of the Left Leg (50-year-old waiter)

a) Clinical Condition and Vein Involved

• Clinical condition: Varicose veins (chronic venous insufficiency / superficial venous incompetence)
• Vein involved: Great (Long) Saphenous Vein - the most commonly affected superficial vein of the lower limb
• The tortuous, dilated, palpable veins on the medial aspect of the leg are a classic presentation. Prolonged standing causes venous hypertension, leading to incompetence of venous valves.

---

b) Formation, Course, Relations, Tributaries, and Termination of the Great Saphenous Vein

• Passes anterior to the medial malleolus
• Ascends along the medial aspect of the leg (with the saphenous nerve)
• Passes posterior to the medial condyle of the femur at the knee
• Ascends along the anteromedial surface of the thigh
• At the femoral triangle, passes through the saphenous opening (fossa ovalis) in the deep fascia (cribriform fascia) - approximately 3.5 cm inferolateral to the pubic tubercle
• Terminates by joining the femoral vein (in the femoral triangle)

1. Superficial epigastric vein
2. Superficial circumflex iliac vein
3. Superficial external pudendal vein
4. Deep external pudendal vein
5. Posterolateral tributary (accessory saphenous vein / lateral cutaneous vein of thigh)

---

c) Perforating Veins - Anatomical Location and Functional Role

• Normally, valves in perforators direct blood from the low-pressure superficial system to the high-pressure deep system (muscle pump assists)
• When valves become incompetent (due to prolonged standing, deep vein thrombosis, pregnancy, obesity), blood is pushed from deep to superficial during muscle contraction - causing venous hypertension in superficial veins
• This leads to venous pooling, varicosities, heaviness, edema, skin changes (lipodermatosclerosis), and ultimately venous ulceration (classically above the medial malleolus - the "gaiter area" - corresponding to Cockett's perforators)

---

Q3. Newborn with Flaccid Right Arm (Shoulder Dystocia)

a) Probable Clinical Condition

• The arm hangs limply at the side, adducted and medially rotated, with forearm extended at elbow and pronated - this is the classic "waiter's tip" or "porter's tip" position
• Caused by excessive traction on the neck/shoulder during difficult delivery (shoulder dystocia), stretching the upper roots of the brachial plexus (C5, C6)

---

b) Root Values Involved

• Deltoid (axillary nerve, C5,C6) - loss of abduction
• Biceps brachii, brachialis, coracobrachialis (musculocutaneous, C5,C6) - loss of elbow flexion and supination
• Supraspinatus, infraspinatus (suprascapular, C5,C6) - loss of abduction initiation and lateral rotation
• Teres minor (axillary, C5,C6) - loss of lateral rotation

---

c) Formation, Relations, Branches, and Applied Anatomy of the Brachial Plexus

• Upper trunk = C5 + C6
• Middle trunk = C7 alone
• Lower trunk = C8 + T1

• Lateral cord = anterior divisions of upper + middle trunks (C5,C6,C7)
• Medial cord = anterior division of lower trunk (C8,T1)
• Posterior cord = posterior divisions of all three trunks (C5-T1)

1. Erb's palsy (C5,C6) - waiter's tip posture; commonest birth injury; due to traction on neck
2. Klumpke's palsy (C8,T1) - claw hand; from traction on abducted arm
3. Thoracic outlet syndrome - compression of lower trunk (C8,T1) + subclavian vessels between rib I and clavicle or by cervical rib
4. Pancoast tumor - apex lung tumor invading lower trunk + stellate ganglion - causing Horner's syndrome (ptosis, miosis, anhidrosis) + hand weakness
5. Winged scapula - long thoracic nerve (C5-C7) injury; serratus anterior palsy

---

Q4. Wrist Drop After Humeral Shaft Fracture (5-year-old, bicycle accident)

a) Structure Involved With Root Value

• Injury at the radial groove (spiral groove) of the humerus (where it is tightly bound with the profunda brachii artery between medial and lateral heads of triceps)
• Fracture of the shaft/midshaft of humerus is the classic cause - the nerve can be stretched or transected at this level

---

b) Course of the Radial Nerve

1. Origin: Largest branch of the posterior cord of brachial plexus (C5-T1)
2. Axilla: Passes posterior to the axillary artery, then between the medial and lateral heads of triceps through the triangular interval (bounded by teres major above, long head of triceps medially, lateral head of triceps laterally)
3. Arm (posterior compartment): Lies in the radial groove on the posterior surface of humerus, accompanied by profunda brachii artery; runs from medial to lateral
4. Lateral intermuscular septum: Pierces it to enter the anterior compartment, lying between brachioradialis and brachialis muscles
5. Elbow/forearm: Enters the forearm anterior to the lateral epicondyle, then divides into:
   • Superficial branch (purely sensory): runs under brachioradialis, emerges in lower forearm to supply dorsum of hand (lateral 3.5 digits down to level of proximal interphalangeal joints)
   • Deep branch (posterior interosseous nerve): pierces the supinator muscle through the arcade of Frohse (proximal edge of supinator), enters the posterior compartment of forearm - purely motor

---

c) Distribution

• In arm: Triceps brachii (all 3 heads), anconeus, brachioradialis, extensor carpi radialis longus (and partly brachialis)
• In forearm (via posterior interosseous nerve): Supinator, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis, extensor indicis

• Posterior cutaneous nerve of the arm
• Inferior lateral cutaneous nerve of the arm
• Posterior cutaneous nerve of the forearm
• Superficial branch of radial nerve: dorsolateral aspect of hand, dorsal surface of lateral 3.5 digits (up to PIP joints)

---

d) Applied Aspects

1. Wrist drop - inability to extend wrist and fingers - hallmark of radial nerve injury in the spiral groove (midshaft humerus fracture). Wrist drop occurs because all wrist and finger extensors are denervated. Note: triceps is usually spared because its branches arise before the spiral groove.
2. "Saturday night palsy" - compression of radial nerve against the spiral groove of humerus (sleeping with arm over the back of a chair), causing wrist drop + sensory loss over dorsum of hand.
3. Sensory loss - over the dorsum of the hand and lateral 3.5 fingers (autonomous zone = dorsum of 1st web space).
4. Posterior interosseous nerve (deep radial) palsy - injury in the forearm, below origin of brachioradialis and ECRL. Wrist extension is intact (ECRL preserved) but finger drop occurs; NO sensory loss.
5. Wartenberg's syndrome - compression of superficial branch of radial nerve at the wrist - pure sensory loss over dorsum of hand.

---

Q5. Pancreas

a) Parts

---

b) Visceral and Peritoneal Relations

• Head: Inferior vena cava, bile duct, portal vein, right renal vessels
• Body: Aorta, origin of superior mesenteric artery, left suprarenal gland, left kidney and renal vessels, splenic vein
• Tail: Left kidney, spleen

---

c) Blood Supply

• Head: Superior pancreaticoduodenal artery (from gastroduodenal artery - a branch of common hepatic artery) and inferior pancreaticoduodenal artery (from superior mesenteric artery) - forming pancreaticoduodenal arcades (anterior and posterior)
• Body and tail: Splenic artery (via dorsal pancreatic, great pancreatic, and caudal pancreatic branches)

---

d) Lymphatic Drainage

• Pancreaticoduodenal lymph nodes
• Coeliac lymph nodes
• Superior mesenteric lymph nodes
• Ultimately to pre-aortic (coeliac) nodes and thoracic duct

---

e) Applied Anatomy

1. Pancreatitis - gallstones obstructing the hepatopancreatic ampulla (ampulla of Vater) cause acute pancreatitis; alcohol causes chronic pancreatitis; pseudocyst formation in lesser sac is a complication
2. Carcinoma of pancreas - head is most common site (60-70%); causes painless obstructive jaundice (compresses bile duct), Courvoisier's sign (palpable distended gallbladder); poor prognosis
3. Portal vein formation - occurs posterior to neck; therefore neck tumors can compress the portal vein causing portal hypertension
4. Insulinoma/glucagonoma - islet cell tumors; insulinoma causes hypoglycemia (Whipple's triad)
5. Whipple's procedure (pancreaticoduodenectomy) - for carcinoma of head; removes head of pancreas, duodenum, distal bile duct, gallbladder, and distal stomach
6. Annular pancreas - congenital malformation where pancreatic tissue encircles the second part of duodenum, causing duodenal obstruction

---

Q6. Portal Vein - Formation, Course, Tributaries, and Portosystemic Anastomosis

Formation

Course

1. Ascends in the free edge of the lesser omentum (hepatoduodenal ligament)
2. In the lesser omentum: bile duct is to the right, hepatic artery proper is to the left, portal vein is posteriorly - "BAP" (Bile-Artery-Portal) or remembered as: portal vein is posterior in the hepatoduodenal ligament
3. The portal vein is anterior to the omental foramen (epiploic foramen of Winslow), making it accessible to Pringle's maneuver
4. At the porta hepatis, divides into right and left branches entering the liver parenchyma

Tributaries

• Right and left gastric veins (from lesser curvature of stomach and lower esophagus)
• Cystic veins (from gallbladder)
• Para-umbilical veins (alongside ligamentum teres, connect to anterior abdominal wall veins)
• (The SMV and splenic vein are its roots of formation; the inferior mesenteric vein joins the splenic vein)

Portosystemic Anastomoses

---

Q7. Uterus (2+2+3+1+2 marks)

a) Normal Position (2 marks)

• Anteverted - the long axis of the uterus is bent forward (anteriorly) at the cervicovaginal junction; the uterus leans forward over the bladder
• Anteflexed - the body of the uterus is bent forward on the cervix at the internal os

---

b) Parts & Relations (2 marks)

1. Fundus - dome-shaped part above the openings of the uterine tubes
2. Body (Corpus) - main bulky central part; cavity is slit-like (sagittal view) / triangular (frontal view)
3. Cervix - lower cylindrical part; divided by vaginal fornix into supravaginal (above) and vaginal (below - portio vaginalis) parts; the central canal of the cervix connects the body cavity to the vaginal cavity

• Anterior: Uterovesical pouch (peritoneal fold between uterus and bladder) → upper surface of bladder
• Posterior: Rectouterine pouch (Pouch of Douglas/cul-de-sac) - the most dependent peritoneal space; can accumulate fluid/blood/pus. Posterior to this is the rectum.
• Lateral: Broad ligament, uterine artery, ureter (the ureter passes under the uterine artery - "water under the bridge" - 1.5 cm lateral to the cervix; important surgical landmark to avoid ureteric injury during hysterectomy)
• Below: Vagina

---

c) Supports (3 marks)

1. Transverse cervical ligament (Mackenrodt's/Cardinal ligament) - most important support; runs from the cervix and vaginal vault to the lateral pelvic wall; contains the uterine artery; resists downward descent
2. Uterosacral ligaments - from the cervix posteriorly to sacrum; maintain anteversion; damaged in prolapse
3. Pubocervical ligaments - from cervix anteriorly to posterior surface of pubic bones; support the vesicouterine angle

---

d) Blood Supply (1 mark)

• Uterine artery (from the anterior division of the internal iliac / hypogastric artery) - the dominant supply
• Crosses the ureter ("water under the bridge") 1.5 cm lateral to the cervix at the level of the internal os
• Anastomoses with the ovarian artery near the uterine tube

• Fundus and upper body: follow ovarian vessels to para-aortic nodes
• Lower body and cervix: external iliac and internal iliac nodes
• Cervix also to obturator nodes
• Round ligament pathway to inguinal nodes (minor)

---

e) Applied Aspects (2 marks)

1. Uterine prolapse - descent of uterus into the vagina (1st degree: cervix within vagina; 2nd: at introitus; 3rd/procidentia: outside). Due to weakened pelvic floor (levator ani) and cardinal/uterosacral ligaments from childbirth or aging. Symptoms: dragging sensation, vaginal lump, urinary incontinence.
2. Ureter injury during hysterectomy - the ureter passes 1.5 cm lateral to the cervix just below the uterine artery and can be inadvertently ligated or cut during hysterectomy - "ureter is sacrificed while clamping the artery."
3. Retroversion - in early pregnancy, a retroverted uterus may become "incarcerated" in the sacral hollow (before the 14th week, after which it rises into the abdomen), causing urinary retention.
4. Cesarean section (LSCS) - the lower uterine segment (isthmus) is the site of incision; avascular, heals well, less risk of bladder damage, away from peritoneal cavity.
5. Cervical carcinoma - spreads to lateral pelvic wall along the cardinal ligament, can obstruct the ureter causing hydronephrosis.

---

Q8. Kidney

a) Location With Extent

---

b) Coverings (from inside out)

1. True (fibrous) capsule - thin fibrous layer directly investing renal parenchyma; easily stripped in health (adherent in inflammation/pyelonephritis)
2. Perinephric fat (perirenal fat) - thick cushion of fatty tissue within the renal fascia; protects the kidney
3. Renal fascia (Gerota's fascia) - a condensation of extraperitoneal fascia enclosing the kidney and suprarenal gland; divided into:
   • Anterior layer (Toldt's fascia) - continuity with the peritoneum
   • Posterior layer (Zuckerkandl's fascia)
   • The two layers fuse laterally and superiorly but are open inferiorly (important - allows a perinephric abscess to track downward into the pelvis)
4. Paranephric fat (pararenal fat) - fat external to Gerota's fascia
5. Peritoneum - covers the anterior surface only (the kidneys are retroperitoneal)

---

c) Relations

• Anterior: Right suprarenal gland (upper pole), right lobe of liver (upper part), second part of duodenum (medially/hilum area), hepatic flexure of colon (lower pole), small intestine
• Posterior: Diaphragm, 12th rib, iliohypogastric and ilioinguinal nerves, quadratus lumborum, psoas major; the subcostal nerve and vessels run behind the kidney

• Anterior: Left suprarenal gland (upper pole), stomach/spleen (upper lateral), tail of pancreas and splenic vessels (at hilum), splenic flexure of colon (lower pole), small intestine
• Posterior: Diaphragm, 11th and 12th ribs, iliohypogastric and ilioinguinal nerves, quadratus lumborum, psoas major

---

d) Blood Supply

• Renal artery - direct branch of the abdominal aorta at the level of L2 (just below the superior mesenteric artery)
• Right renal artery is longer and passes posterior to the IVC, right renal vein, and head of pancreas
• Left renal artery is shorter; passes posterior to the left renal vein and body of pancreas
• Each renal artery divides into anterior and posterior segmental arteries at/before the hilum, supplying 5 vascular segments of the kidney (apical, upper, middle, lower, posterior). These are end arteries (no anastomosis between segments) - infarction of individual segments is possible.
• Accessory renal arteries - present in ~25-30% of individuals; arise directly from the aorta; usually enter at the poles (lower pole most common) - these are important in renal transplant surgery

• Renal veins drain into the inferior vena cava
• Left renal vein is longer (crosses the aorta anteriorly); receives left gonadal (testicular/ovarian), left suprarenal, and left inferior phrenic veins
• Right renal vein is short; tributaries are minimal

---

e) Applied Aspects

1. Renal calculi (nephrolithiasis) - stones form in the renal pelvis/calyx; can obstruct at three sites of ureteric narrowing: PUJ, crossing of iliac vessels, vesicoureteric junction. Colicky flank pain radiating to groin. Managed by ESWL, ureteroscopy, or PCNL.
2. Horseshoe kidney - most common renal fusion anomaly; lower poles fused across the midline by an isthmus; lies lower than normal (held by inferior mesenteric artery); usually asymptomatic but predisposes to stones and UTI.
3. Perinephric abscess - infection in the perinephric fat; can track downward (as the renal fascia is open inferiorly) into the pelvis; presents as fever + loin mass.
4. Renal transplant - donor kidney is placed heterotopically in the right iliac fossa (not the normal anatomical position) with anastomosis to iliac vessels.
5. Percutaneous nephrolithotomy (PCNL) - the posterior calyx is accessed percutaneously via the posterior approach; the needle is passed through the 12th rib bed and the posterior layer of Gerota's fascia into the renal pelvis.
6. Retroperitoneal haematoma - after blunt renal trauma; blood is contained by Gerota's fascia; clinically presents as loin ecchymosis (Grey Turner's sign).
7. Nutcracker phenomenon - the left renal vein is compressed between the aorta and superior mesenteric artery, causing left-sided haematuria and gonadal pain.

---

• Q1 - Cause (anterior dislocation) + all 4 sub-parts (ligaments, movements with muscles, applied)
• Q2 - Varicose veins + all 3 sub-parts (GSV formation/course/tributaries/termination, perforating veins)
• Q3 - Erb's palsy + all 3 sub-parts (diagnosis, root value, full brachial plexus with formation/branches/applied)
• Q4 - Radial nerve + all 4 sub-parts (structure + root, course, distribution, applied)
• Q5 - Pancreas under all 5 headings (parts, visceral/peritoneal relations, blood supply, lymphatics, applied)
• Q6 - Portal vein formation, parts, course, all tributaries, + portosystemic anastomoses table with clinical consequences
• Q7 - Uterus under all 5 headings matching the mark scheme (2+2+3+1+2)
• Q8 - Kidney under all 5 headings (location/extent, coverings, relations, blood supply, applied)

• Blue header banner with your college/paper details on every page
• Dark blue question banners, light blue section headers
• Red-tinted "Applied Anatomy" boxes on every question
• All ligaments, muscles, nerves, tributaries in formatted tables
• Page numbers in footer

---

SHORT NOTES — COMPLETE ANSWERS

Phase I MBBS Anatomy | Shri Sathya Sai Medical College

---

1. Lymphatic Drainage of Mammary Gland

• Anterior (pectoral) nodes — from lateral and inferior quadrants
• Central nodes
• Apical nodes — final common pathway; drain into subclavian lymph trunk

• Internal mammary (parasternal) nodes — from medial quadrants (25%)
• Interpectoral (Rotter's) nodes — between pectoralis major and minor
• Supraclavicular nodes — via apical nodes
• Contralateral breast — via subareolar plexus crossing midline
• Infraclavicular nodes — upper outer quadrant

---

2. Development of Graafian Follicle with Applied Aspects

1. Primordial follicle — oocyte arrested in prophase I, surrounded by a single layer of flat granulosa cells
2. Primary follicle (unilaminar) — granulosa cells become cuboidal; zona pellucida begins forming
3. Primary follicle (multilaminar) — zona pellucida complete; multiple layers of granulosa cells; theca interna + externa develop
4. Secondary (antral/vesicular) follicle — fluid (liquor folliculi/antrum) appears between granulosa cells; oocyte is eccentric; cumulus oophorus forms
5. Graafian (mature) follicle — large (20 mm); antrum occupies most of follicle; oocyte resumes meiosis; cumulus projects into antrum; follicle bulges from ovarian surface
6. Ovulation — LH surge triggers completion of meiosis I; secondary oocyte + first polar body released; meiosis II arrested at metaphase II

• Follicular cysts: unruptured Graafian follicles; can enlarge and cause pain
• Polycystic ovarian syndrome (PCOS): multiple arrested antral follicles
• Ovarian stimulation for IVF uses FSH to develop multiple Graafian follicles
• Mittelschmerz: pain at ovulation from peritoneal irritation by follicular fluid

---

3. Cubital Fossa — Boundaries, Contents, Clinical Significance

• Biceps brachii tendon (central)
• Brachial artery (medial to tendon) — divides into radial and ulnar arteries at the apex (neck of radius)
• Median nerve (most medial)
• Radial nerve lies in the groove between brachioradialis and brachialis (strictly outside but related)

1. Venepuncture site — median cubital vein crosses the roof (overlies bicipital aponeurosis, which protects the brachial artery from needling)
2. Blood pressure measurement — brachial artery auscultated here
3. Brachial artery injury — supracondylar fracture of humerus in children may injure the brachial artery → Volkmann's ischaemic contracture
4. Cubital tunnel syndrome — ulnar nerve compression at the medial epicondyle (not in fossa but nearby)
5. Lymph nodes — cubital/supratrochlear nodes drain medial forearm and ring+little fingers

---

4. Sesamoid Bone

1. Protects tendons from wear and friction at bony prominences
2. Alters angle of pull of a muscle (increases mechanical advantage)
3. Reduces friction between tendon and underlying bone
4. Increases leverage of muscle force

• Patella (largest sesamoid) — in quadriceps tendon; increases leverage for knee extension
• Fabella — in lateral head of gastrocnemius
• Sesamoids of big toe — in flexor hallucis brevis tendons at 1st MTP joint
• Pisiform — in flexor carpi ulnaris at wrist

---

5. Gluteus Maximus — Origin, Insertion, Nerve Supply, Action, Applied

• Posterior gluteal line of ilium and the iliac crest behind it
• Posterior surface of sacrum and coccyx
• Sacrotuberous ligament and thoracolumbar fascia

• Iliotibial tract of fascia lata (upper 3/4)
• Gluteal tuberosity of femur (lower 1/4)

1. Powerful extensor of the hip — especially from flexed position (climbing stairs, rising from chair)
2. Lateral rotator of the hip
3. Upper fibers: abduction of hip; Lower fibers: adduction
4. Through iliotibial tract: stabilizes knee in extension

1. Gluteal gait — weakness of gluteus maximus → trunk leans backward over affected hip at heel strike (extension gait) to avoid falling
2. Intramuscular injections — should be given in the upper outer quadrant of the buttock (safe zone: avoids the sciatic nerve which lies in the lower medial quadrant)
3. Piriformis syndrome — can compress sciatic nerve as it exits below piriformis
4. Pressure sores — sacral/ischial region in bedridden patients; gluteus maximus bulk protects ischial tuberosity when standing
5. Gluteus maximus flap — used for sacral pressure sore reconstruction

---

6. Microanatomy of Large Artery (Elastic Artery)

• Single layer of endothelial cells on a basement membrane
• Subendothelial layer of loose connective tissue
• Internal elastic lamina — well defined (thinner than in muscular arteries)

• 40–70 layers of fenestrated elastic lamellae (sheets of elastin)
• Smooth muscle cells between elastic sheets
• Collagen fibers and proteoglycans
• No external elastic lamina (merges with adventitia)

• Loose connective tissue (collagen + elastic fibers)
• Contains vasa vasorum (vessels supplying the wall)
• Lymphatics and nerve fibers (vasomotor)

---

7. Microanatomy of Uterus — Secretory Phase

• Perimetrium (serosa)
• Myometrium (thick smooth muscle)
• Endometrium — shows cyclic changes

1. Glands — become tortuous, saw-toothed/corkscrew-shaped with wide lumina; tall columnar cells with abundant basal glycogen (glycogen vacuoles first appear subnuclearly → later secreted into lumen)
2. Glandular secretions — rich in glycogen and glycoproteins; nourish the blastocyst before implantation
3. Stroma — becomes edematous (predecidual change); stromal cells enlarge and become polyhedral (decidualization begins)
4. Spiral arteries — become markedly coiled and elongated; reach the surface
5. Epithelium — tall columnar; luminal surface has pinopodes (projections) at peak receptivity

---

8. Extrahepatic Biliary Apparatus with Applied Anatomy

1. Right and left hepatic ducts — emerge from right and left lobes; unite to form common hepatic duct at porta hepatis
2. Common hepatic duct — ~4 cm long; descends in free edge of lesser omentum
3. Cystic duct — from gallbladder; has spiral valve of Heister; joins common hepatic duct to form common bile duct
4. Common bile duct (CBD) — ~7.5 cm long; divided into 4 parts:
   • Supraduodenal (in free edge of lesser omentum, right of portal vein, right of hepatic artery)
   • Retroduodenal (behind 1st part of duodenum)
   • Infraduodenal/pancreatic (in groove behind head of pancreas)
   • Intraduodenal — passes obliquely through wall of 2nd part of duodenum
5. Hepatopancreatic ampulla (ampulla of Vater) — CBD + pancreatic duct (of Wirsung) join; controlled by sphincter of Oddi; opens at major duodenal papilla

1. Gallstones (cholelithiasis) — most common at gallbladder; if pass into CBD → obstructive jaundice; impaction at ampulla → pancreatitis
2. Courvoisier's law — if CBD obstruction due to carcinoma of pancreas head → painless progressive jaundice + palpable non-tender gallbladder (gallbladder wall is normal)
3. Cholecystectomy — Calot's triangle (cystic artery, cystic duct, hepatic duct) must be defined; cystic artery ligated
4. Mirizzi syndrome — large gallstone impacted in Hartmann's pouch compresses the common hepatic duct externally
5. Choledochal cyst — congenital dilatation of CBD

---

9. Formation and Contents of Rectus Sheath

• Rectus abdominis muscle
• Pyramidalis muscle (small, at lower end)
• Superior epigastric artery (from internal thoracic)
• Inferior epigastric artery (from external iliac)
• Venae comitantes of above arteries
• Lymphatics
• Lower 5 intercostal nerves (T7–T11) and subcostal nerve (T12)

---

10. Development of Diaphragm with Anomalies

• Phrenic nerve (C3,4,5) — motor to all diaphragm + sensory to central part
• Intercostal nerves (T6–T12) — sensory to peripheral part only

1. Congenital diaphragmatic hernia (CDH) / Bochdalek hernia — failure of pleuroperitoneal membrane to close the posterolateral foramen (of Bochdalek); 90% on left side; abdominal contents herniate into thorax → lung hypoplasia; presents at birth with respiratory distress and scaphoid abdomen
2. Morgagni hernia — through the anterior foramen of Morgagni (between sternal and costal origins); right-sided; usually asymptomatic
3. Esophageal hiatus widening — hiatus hernia (sliding or rolling/paraesophageal)
4. Eventration of diaphragm — thinning/absence of diaphragmatic muscle; diaphragm is raised on one side

---

11. Ligamentous Support and Blood Supply of Urinary Bladder

• Lateral ligaments — condensations of pelvic fascia from lateral bladder wall to pelvic side wall; contain vesical vessels
• Posterior ligaments — to rectum (puboprostatic in males / pubovesical in females)
• Median umbilical ligament — remnant of urachus; from bladder apex to umbilicus (in median umbilical fold)

• Medial umbilical folds — over obliterated umbilical arteries
• Lateral vesical folds — over inferior epigastric vessels

• Levator ani (pubovesicalis/puborectalis fibers)
• Puboprostatic ligaments (males) / Pubovesical ligaments (females)

• Superior vesical arteries — from the patent part of the umbilical artery (anterior division of internal iliac artery) — supply upper/superior bladder
• Inferior vesical artery (males) / Vaginal artery (females) — from anterior division of internal iliac artery — supply bladder base, seminal vesicles, and prostate
• Obturator and inferior gluteal arteries — small contributions

---

12. Interior of Anal Canal with Applied Anatomy

• Anal columns (of Morgagni) — 6–10 vertical folds of mucosa containing terminal branches of superior rectal vessels
• Anal valves — semilunar folds connecting bases of anal columns
• Anal sinuses — recesses between anal valves and anal columns; contain anal glands (open here)
• Lining — columnar/transitional epithelium (derived from endoderm)
• Arterial supply — superior rectal artery (from inferior mesenteric artery)
• Venous drainage — superior rectal vein → portal system
• Lymphatics → internal iliac nodes
• Nerve supply — autonomic (insensate to pain)

• Pecten — smooth zone of stratified squamous epithelium (not truly keratinized above the anal verge)
• Lining — stratified squamous epithelium (ectodermal, from proctodeum)
• Arterial supply — inferior rectal artery (from internal pudendal artery)
• Venous drainage — inferior rectal vein → systemic (internal pudendal vein → internal iliac)
• Lymphatics → superficial inguinal nodes
• Nerve supply — somatic (painful; inferior rectal nerve)

1. Internal hemorrhoids — above pectinate line (painless); external hemorrhoids — below (painful)
2. Carcinoma — above: adenocarcinoma (drains to internal iliac); below: squamous cell carcinoma (drains to inguinal nodes)
3. Fissure-in-ano — typically in posterior midline (poorly vascularized); painful on defecation

---

13. Rotator Cuff Muscles — Names, Nerve Supply, Actions

---

14. Meniscus of Knee Joint — Parts, Attachments, Functions

• C-shaped (larger)
• Attached to medial collateral ligament and joint capsule (less mobile)
• Anterior horn attaches to intercondylar area; posterior horn behind posterior cruciate ligament
• Medial meniscus is more commonly torn (less mobile due to MCL attachment)

• O-shaped/circular (smaller)
• Not attached to lateral collateral ligament (more mobile → less commonly torn)
• Posterior horn gives attachment to ligament of Wrisberg (and Humphrey) to medial femoral condyle
• Tendon of popliteus passes between lateral meniscus and capsule

• Both menisci attached at anterior and posterior horns to tibial intercondylar area
• Connected to each other anteriorly by transverse (intermeniscal) ligament
• Peripheral border attached to joint capsule
• Deep surface of medial meniscus fused with MCL

1. Load transmission / shock absorption — menisci bear 50–70% of load in full extension
2. Joint congruity — deepen the shallow tibial plateau to improve fit with femoral condyles
3. Stability — prevent excessive rolling/gliding
4. Lubrication — spread synovial fluid across articular surfaces
5. Proprioception — sensory nerve endings in outer 1/3

---

15. Microanatomy of Spinal Ganglion (Dorsal Root Ganglion)

1. Connective tissue capsule — continuation of epineurium
2. Neuronal cell bodies — large, spherical (pseudounipolar) neurons:
   • Each cell body gives off a single process which immediately divides into peripheral and central processes (T-shaped bifurcation)
   • Peripheral process — conducts sensory impulses from periphery
   • Central process — enters spinal cord via dorsal root
3. Satellite cells (capsule cells) — small flattened cells surrounding each neuron cell body; analogous to Schwann cells; provide metabolic support
4. Nerve fibers — myelinated and unmyelinated; run between cell body clusters in bundles
5. Blood vessels — well vascularized (no blood-nerve barrier in ganglia — unlike peripheral nerves)
6. No synapses — sensory ganglia have no synaptic contacts on cell bodies (differs from autonomic ganglia)

---

16. Somites — Definition and Major Derivatives

---

17. Anastomosis — Definition and Types

• True end arteries — no anastomoses at all (e.g., retinal artery, central artery of spleen)
• Functional end arteries — anastomoses present but too small to be effective (e.g., renal segmental arteries, coronary arteries)

---

18. Stomach Bed — Anatomical Structures

1. Left dome of diaphragm — upper left
2. Spleen — left side
3. Left suprarenal (adrenal) gland — upper middle
4. Upper pole of left kidney — below suprarenal
5. Splenic artery — along upper border of pancreas
6. Body and tail of pancreas — central and most important structure
7. Transverse mesocolon — inferior

---

19. Perineal Membrane in Males — Attachments, Extent, Structures Piercing

• Laterally: Ischiopubic rami bilaterally
• Posteriorly: Perineal body (central tendon of perineum)
• Anteriorly: Merges with suspensory ligament of penis; free edge posteriorly forms the posterior border (transverse perineal ligament)

1. Urethra (membranous urethra) — most important; passes through the external urethral sphincter (sphincter urethrae) which sits within the perineal membrane
2. Bulbourethral (Cowper's) gland ducts — drain into spongy urethra
3. Arteries to the bulb of penis
4. Branches of dorsal nerve of penis
5. Deep arteries of the penis (from internal pudendal artery)

---

20. Microanatomy of Ileum

• Simple columnar epithelium with goblet cells + enterocytes
• Villi — finger-like projections (shorter and broader than jejunum); covered by enterocytes with microvilli (brush border)
• Crypts of Lieberkühn — intestinal glands at base of villi; contain stem cells, Paneth cells, enteroendocrine cells
• Paneth cells — in bases of crypts; contain eosinophilic granules with defensins/lysozymes (antibacterial)

• Peyer's patches (aggregated lymphoid nodules) — large clusters of lymphoid tissue in the mucosa and submucosa of the anti-mesenteric border; MORE numerous in ileum than jejunum
• Less prominent villi compared to jejunum
• More goblet cells than jejunum
• No plicae circulares in terminal ileum (fewer than jejunum)
• Fewer lacteals than jejunum

---

21. Cryptorchidism — Definition and Factors Responsible

• Abdominal — above deep inguinal ring
• Inguinal — in inguinal canal
• Incomplete scrotal — at superficial ring or upper scrotum
• Ectopic — in abnormal position outside normal path (e.g., perineum, thigh, femoral triangle)
• Retractile — normal testis that retracts into groin (not truly undescended)

1. Gubernaculum — fibromuscular cord from testis to scrotal floor; shortens and guides testis into scrotum; intraabdominal descent depends on rapid body wall growth while gubernaculum remains same length
2. Intra-abdominal pressure — pushes testis through inguinal canal
3. Cremaster muscle — contraction aids scrotal entry
4. Genitofemoral nerve — releases calcitonin gene-related peptide (CGRP) which acts on gubernaculum; androgen-dependent
5. Androgens (testosterone) — essential; without them, gubernaculum fails to regress and guide descent
6. MIF (Müllerian Inhibiting Factor) — indirectly involved

1. Increased risk of malignancy (seminoma) — heat impairs spermatogenesis and causes dysplasia; relative risk 4–10× higher
2. Infertility — spermatogenesis requires 2°C below body temperature
3. Orchidopexy — surgical correction before age 2 (ideally before 1 year)
4. Increased risk of torsion and inguinal hernia (patent processus vaginalis)

---

22. Supination and Pronation — Joints, Muscles

1. Superior (proximal) radioulnar joint — pivot joint at the radial head in the annular ligament; below the elbow
2. Inferior (distal) radioulnar joint — pivot joint at the ulnar head; at the wrist
3. Middle radioulnar joint — the interosseous membrane; not a true synovial joint but allows force transmission

---

23. Trendelenburg's Sign

• Superior gluteal nerve (L4, L5, S1) — innervates gluteus medius, gluteus minimus, and tensor fasciae latae

1. Gluteus medius — primary hip abductor; MOST important
2. Gluteus minimus — assists abduction
3. Tensor fasciae latae — assists abduction

1. Weakness of hip abductors — superior gluteal nerve palsy, poliomyelitis, myopathy
2. Unstable fulcrum — dislocated hip (developmental dysplasia), arthritis of hip
3. Short limb — coxa vara (reduced neck-shaft angle)
4. Pain inhibition — antalgic gait (patient spares the hip from pain)

---

24. Popliteal Artery — Origin, Extent, Course, Branches

• Anterior (deep): Posterior surface of knee joint capsule, popliteal surface of femur, posterior surface of tibia
• Posterior (superficial): Popliteal vein and tibial nerve (vein between artery and nerve)

• Anterior tibial artery — passes forward through gap in interosseous membrane
• Posterior tibial artery (+ peroneal/fibular artery) — continues down the posterior compartment

---

25. Epiphysis — Definition and Types

• Slipped capital femoral epiphysis (SCFE) — displacement of the upper femoral epiphysis on the femoral neck; obese adolescent boys; presents with hip pain and limp
• Osgood-Schlatter disease — traction apophysitis of tibial tuberosity
• Salter-Harris fractures — classify physeal injuries; important because growth plate damage can cause growth arrest

---

26. Microanatomy of Lymph Node

• Lymphoid follicles (primary) — dense aggregates of B-lymphocytes; no germinal center
• Secondary follicles — have germinal centers (pale center); appear after antigen stimulation; contain proliferating B-cells, follicular dendritic cells, macrophages
• Marginal zone — around germinal center; mature B-cells

• T-lymphocyte zone (thymus-dependent)
• High endothelial venules (HEV) — site of lymphocyte recirculation from blood
• Interdigitating dendritic cells (present antigen to T-cells)

• Medullary cords — strands of lymphoid tissue; plasma cells, macrophages, B-cells
• Medullary sinuses — spaces between cords; lined by endothelium + macrophages; filter lymph

• Subcapsular sinus (under capsule)
• Cortical sinuses (peritrabecular)
• Medullary sinuses → efferent lymphatic vessel at hilum

---

27. Implantation — Normal and Abnormal Sites

1. Apposition — blastocyst loosely adheres to endometrium (inner cell mass toward endometrium)
2. Adhesion — trophoblast firmly attaches
3. Invasion — syncytiotrophoblast invades endometrial stroma and glands

---

28. Positions of Appendix and Arterial Supply

• Appendicular artery — a branch of the ileocolic artery (from the superior mesenteric artery)
• The appendicular artery is an end artery — runs in the mesoappendix
• Thrombosis of appendicular artery → gangrenous appendicitis

---

29. Bare Area of Liver and Applied Importance

• Superiorly: Upper layer of coronary ligament
• Inferiorly: Lower layer of coronary ligament
• Laterally (right): The two layers meet to form the right triangular ligament
• Medially: IVC in its groove

• Inferior vena cava (in its groove)
• Right suprarenal gland (in direct contact)
• Hepatic veins drain into IVC here
• Portal lymphatics communicate with diaphragmatic lymphatics

1. Direct spread of infection — subphrenic abscess can spread directly between liver and diaphragm through the bare area (no peritoneal barrier)
2. Hepatocellular carcinoma — can invade the diaphragm directly through the bare area
3. Portosystemic communication — small veins in bare area connect portal circulation to phrenic veins (systemic) — a minor portosystemic anastomosis
4. Liver transplantation — bare area identification is important in total hepatectomy
5. Diaphragmatic hernia — rare direct communication between peritoneal and pleural cavities

---

30. Ischiorectal Fossa — Boundaries, Contents, Applied

1. Ischiorectal fat — supports anal canal; allows expansion during defecation
2. Pudendal canal (Alcock's canal) — on the lateral wall (within the obturator fascia); contains:
   • Internal pudendal artery and vein
   • Pudendal nerve (S2,S3,S4)
3. Inferior rectal nerve (branch of pudendal) — crosses the fossa to supply external anal sphincter + anal canal below pectinate line
4. Perineal branch of S4 nerve
5. Lymphatics

1. Ischiorectal abscess — most common anorectal abscess; presents as throbbing perineal pain; treated by incision and drainage
2. Horseshoe abscess — communicates across deep post-anal space to both fossae
3. Fistula-in-ano — after ischiorectal abscess; Parks' classification based on relation to external sphincter
4. Pudendal nerve block — can be performed via the ischiorectal fossa (landmarks: ischial spine)

---

31. Coronal Section of Kidney — Macroscopic Features

• Reddish-brown granular zone
• Contains renal corpuscles (glomeruli + Bowman's capsule), proximal and distal convoluted tubules
• Columns of Bertin (renal columns) — cortical tissue that dips between medullary pyramids

• Pale, striated appearance
• Divided into 8–18 renal pyramids (medullary pyramids):
  • Base faces cortex; apex (renal papilla) projects into minor calyx
  • Contain loops of Henle and collecting ducts
  • Papillary ducts (of Bellini) open at area cribrosa at the tip of each papilla

• Contains: Minor calyces (8–18), Major calyces (2–3), Renal pelvis, Renal vessels, Lymphatics, Fat, Nerves

• Minor calyx — cup-shaped; surrounds each papilla; 8–18 total
• Major calyx — 2–3; formed by union of minor calyces
• Renal pelvis — formed by union of major calyces; leaves hilum as ureter at PUJ

---

32. Development of Pancreas with Annular Pancreas

• Arises from 2 endodermal buds from the caudal foregut (duodenum), weeks 5–8:
  1. Dorsal pancreatic bud — larger; arises from dorsal wall of duodenum; forms body, tail, and superior part of head; connects to duodenum via accessory duct (duct of Santorini)
  2. Ventral pancreatic bud — smaller; arises from the hepatic diverticulum (near bile duct); rotates clockwise with the bile duct to fuse with dorsal bud; forms the uncinate process and inferior part of head
• At week 7, the ventral bud rotates posteriorly (with the bile duct) and fuses with the dorsal bud
• The main duct of Wirsung = formed by fusion of entire ventral duct + distal part of dorsal duct
• Islets of Langerhans develop from pancreatic parenchyma during months 3–5

• Occurs when the right portion of the bifid ventral bud fails to rotate with the bile duct, or when both parts of the ventral bud surround the duodenum before rotation
• Results in a ring of pancreatic tissue encircling the 2nd part of the duodenum
• Clinical: Duodenal obstruction (can be complete or partial); presents in neonates with bilious vomiting; associated with Down syndrome and intestinal malrotation
• X-ray: "Double bubble" sign (gas in stomach + proximal duodenum)
• Treatment: Surgical bypass (duodenoduodenostomy or duodenojejunostomy) — the ring is NEVER divided (risk of fistula/pancreatitis)

---

33. Microanatomy of Suprarenal (Adrenal) Gland

• Large chromaffin cells (pheochromocytes) — polygonal; stain brown with chromium salts
• Arranged in groups/cords around venous sinuses
• Preganglionic sympathetic fibers directly innervate these cells (equivalent to postganglionic sympathetic neurons)
• Secrete Adrenaline (epinephrine) ~80% and Noradrenaline (norepinephrine) ~20%

---

34. Popliteal Fossa — Boundaries, Contents, Applied

1. Tibial nerve — most superficial; bisects the fossa
2. Common peroneal (fibular) nerve — medial to biceps femoris tendon
3. Popliteal vein — deep to tibial nerve
4. Popliteal artery — deepest; crosses the fossa diagonally
5. Small saphenous vein — pierces deep fascia to drain into popliteal vein
6. Popliteal lymph nodes (4–5) — around the popliteal vessels
7. Fat — fills the fossa

1. Popliteal aneurysm — most common peripheral aneurysm; pulsatile swelling behind knee; risk of distal embolism and acute limb ischemia
2. Baker's cyst (popliteal cyst) — herniation of synovial membrane through the joint capsule; presents as swelling in medial popliteal fossa; associated with OA/RA
3. Common peroneal nerve injury — at the neck of fibula (where the nerve winds around it); foot drop
4. Popliteal access — for popliteal artery angiography; tibial nerve must be avoided

---

35. Spermatogenesis — Stages with Applied Anatomy

• Spermatogonia (type A and B) lie on the basement membrane
• Type A spermatogonia → stem cells that self-renew
• Type B spermatogonia → primary spermatocytes (2n, 4c) — begin meiosis I

• Primary spermatocyte (2n) → 2 secondary spermatocytes (n, 2c)
• Takes ~24 days (longest stage; leptotene, zygotene, pachytene, diplotene stages of prophase I)

• Secondary spermatocyte → 2 spermatids (n, 1c) — haploid
• Each primary spermatocyte ultimately produces 4 spermatids

• Golgi phase → acrosomal cap forms (from Golgi; contains hydrolytic enzymes for zona pellucida penetration)
• Acrosomal phase → nucleus condenses; flagellum forms from centriole
• Maturation phase → excess cytoplasm shed as residual body (phagocytosed by Sertoli cells)
• Result: mature spermatozoon with head (acrosome + nucleus), neck, middle piece (mitochondria), tail (axoneme)

1. Azoospermia — absence of sperm; obstructive (block) or non-obstructive (failure of spermatogenesis); causes of non-obstructive: Klinefelter's syndrome (47,XXY), varicocele, cryptorchidism
2. Varicocele — dilated pampiniform plexus; raises scrotal temperature → impairs spermatogenesis; treat with varicocelectomy or embolization
3. Chemotherapy — damages rapidly dividing spermatogonia → azoospermia

---

36. Flexor Retinaculum — Anatomy and Applied Aspects

• Medially: Pisiform and hook of hamate
• Laterally: Tubercle of scaphoid and tubercle of trapezium

1. Median nerve — most important; lies superficially (just below retinaculum) on the radial side
2. Flexor pollicis longus tendon (1)
3. Flexor digitorum superficialis tendons (4)
4. Flexor digitorum profundus tendons (4)

• Total = 9 tendons + 1 nerve

• Flexor carpi radialis (in its own tunnel in a groove on the trapezium)
• Palmaris longus — most superficial
• Ulnar nerve and artery — pass through Guyon's canal (medial to retinaculum)
• Palmar cutaneous branch of median nerve (branches above wrist)

1. Carpal tunnel syndrome (CTS) — compression of median nerve under flexor retinaculum; most common nerve entrapment syndrome; causes: repetitive use, pregnancy (edema), hypothyroidism, acromegaly, RA, Colles' fracture
2. Symptoms: Tingling/numbness in lateral 3½ digits, thenar wasting (abductor pollicis brevis), nocturnal pain
3. Tests: Tinel's sign (tapping over retinaculum) + Phalen's test (maximal wrist flexion for 60s)
4. Treatment: Splinting, steroid injection, surgical decompression (division of retinaculum)

---

37. Parts of Long Bone with Blood Supply

1. Nutrient (medullary) artery — enters via nutrient foramen in the diaphysis (directed away from growing end — toward the knee, away from the elbow); supplies medullary cavity + inner 2/3 of cortex
2. Periosteal arteries — supply outer 1/3 of cortex; from periosteum
3. Metaphyseal arteries — from periarticular arterial plexus at each end; supply metaphysis
4. Epiphyseal arteries — supply epiphysis; enter through periosteum at periphery (important: these are separate from metaphyseal supply before growth plate closure — "danger area" in children)

---

38. Locking and Unlocking of Knee Joint

• Popliteus rotates the femur laterally on the fixed tibia (or medially rotates the tibia in open-chain)
• Nerve supply: Tibial nerve (L4, L5, S1)
• Origin: Lateral surface of lateral femoral condyle (and lateral meniscus)
• Insertion: Posterior surface of tibia above soleal line

---

39. Microanatomy of Hyaline Cartilage

1. Perichondrium — present on all hyaline cartilage EXCEPT articular cartilage and epiphyseal plates; has:
   • Outer fibrous layer (dense connective tissue)
   • Inner chondrogenic layer (chondroblasts → chondrocytes)
2. Matrix:
   • Type II collagen fibers (not visible by light microscopy — masked by glycosaminoglycans)
   • Ground substance: aggrecan (chondroitin sulfate + keratan sulfate attached to hyaluronic acid core)
   • Appears glassy/homogeneous (hyalos = glass in Greek)
   • Basophilic (due to sulfated GAGs)
3. Chondrocytes:
   • Mature cells residing in lacunae
   • In deeper zones: form isogenous groups (cell nests) — clusters of 2–8 cells derived from a single chondrocyte by mitosis
4. Territorial matrix — matrix immediately surrounding isogenous groups; more intensely stained (more GAGs)
5. Interterritorial matrix — between cell nests; less intensely stained
6. Avascular — nutrients reach chondrocytes by diffusion through matrix

---

40. Microanatomy of Testis

• Convoluted → straight → rete testis → efferent ductules → epididymis
• Lined by complex stratified germinal epithelium containing:
  1. Spermatogenic cells (from basal to luminal): Spermatogonia → Primary spermatocytes → Secondary spermatocytes → Spermatids → Spermatozoa
  2. Sertoli cells (supporting cells):
     • Tall columnar; extend from basement membrane to lumen
     • Form the blood-testis barrier (tight junctions between adjacent Sertoli cells)
     • Functions: nourish spermatogenic cells; phagocytose residual bodies; secrete inhibin (↓FSH), androgen-binding protein, MIF; regulate spermatogenesis

• Leydig (interstitial) cells — large, polyhedral; eosinophilic; contain lipid droplets; Reinke crystalloids (pathognomonic eosinophilic crystals); stimulated by LH to produce testosterone
• Loose connective tissue, blood vessels, lymphatics, macrophages, mast cells

---

41. Boundaries and Contents of Deep Perineal Pouch

• Floor (inferior): Perineal membrane (inferior fascia of UG diaphragm)
• Roof (superior): Superior fascia of UG diaphragm
• Laterally: Ischiopubic rami
• Anteriorly: Open (no anterior boundary — communicates with retropubic space)

1. External urethral sphincter (sphincter urethrae) — voluntary, skeletal muscle; most important for continence
2. Membranous urethra — passes through the pouch
3. Bulbourethral (Cowper's) glands — pea-sized; open into spongy urethra; secrete pre-ejaculatory fluid
4. Deep transverse perinei muscles — paired; pass transversely
5. Internal pudendal artery — gives off: artery to bulb, deep artery of penis/clitoris, dorsal artery of penis/clitoris
6. Dorsal nerve of penis/clitoris (branch of pudendal nerve)
7. Remnants of levator ani fibers

• External urethral sphincter
• Urethra + vaginal opening
• Deep transverse perinei muscles
• Internal pudendal vessels + dorsal nerve of clitoris
• Greater vestibular glands (Bartholin's) are in the superficial pouch (NOT deep pouch)

---

42. Blood Supply and Lymphatic Drainage of Stomach

• Left + right gastric veins → portal vein directly
• Left gastric vein also communicates with esophageal veins (portosystemic)
• Right gastro-omental → superior mesenteric vein
• Left gastro-omental + short gastric → splenic vein

• Follows arterial territories; ultimately drain to coeliac nodes (pre-aortic)

---

43. Rotation of Midgut — Stages and Anomalies

1. Herniation phase (week 6): Midgut loop herniates into umbilical cord; has a superior limb (proximal small bowel) and inferior limb (cecum + ascending colon)
2. Rotation (total 270° counterclockwise when viewed from front):
   • First 90° (in umbilical cord): Superior limb moves to right, inferior limb to left (cecal bud appears on superior limb side)
   • Second 90° (on return at week 10): Superior limb continues counterclockwise; total 180° at return; duodenum passes behind SMA
   • Third 90° (after return): Cecum moves from below liver to right iliac fossa; total 270° counterclockwise

• Duodenum lies to the right of the spine (retroperitoneal)
• Jejunum and ileum occupy the center
• Cecum in right iliac fossa; ascending colon on right; transverse colon crosses; descending colon on left

---

44. Supports of Uterus with Applied Anatomy

• Levator ani (pelvic diaphragm) — pubococcygeus + iliococcygeus + ischiococcygeus
• Puborectalis forms the anorectal sling
• Weakness → prolapse

• Broad ligament (double peritoneal fold)
• Round ligament (maintains anteversion; weak)
• Ovarian ligament

1. Uterine prolapse — degree I (within vagina), II (at introitus), III/procidentia (outside); causes: multiparity, menopause, obesity, connective tissue disease
2. Uterosacral ligaments — key in posterior colporrhaphy repair; often affected by endometriosis
3. Uterine artery — contained in cardinal ligament; ureter passes just below it (ureter at risk during hysterectomy)
4. Round ligament pain — common in pregnancy (stretching); follows path of inguinal canal; can be confused with inguinal hernia
5. Le Fort operation — colpocleisis for procidentia in elderly patients; obliterates vaginal canal

---

45. Portosystemic Anastomosis with Applied Anatomy

1. Esophageal varices — treatment: vasopressin/terlipressin (acute); propranolol (prophylaxis); endoscopic variceal band ligation (EVL); Sengstaken-Blakemore tube (temporary tamponade); TIPS (radiological shunt)
2. TIPS — Transjugular Intrahepatic Portosystemic Shunt; creates artificial shunt between portal and hepatic veins via jugular vein approach; reduces portal pressure; used for variceal bleeding and refractory ascites
3. Splenorenal shunt (Warren shunt) — surgical; connects splenic vein to left renal vein; decompresses varices
4. Caput medusae — blood flows away from umbilicus (distinguish from SVC obstruction where flow is from below upward)
5. Portopulmonary hypertension — portal hypertension → pulmonary arterial hypertension via humoral factors
6. Hepatic encephalopathy — in portosystemic shunting, ammonia bypasses liver → brain toxicity
7. Congenital extrahepatic portosystemic shunts (Abernethy malformation) — rare; portal blood bypasses liver from birth

---

---