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Arterial Supply of the Whole Body - MBBS Year 1
Here is a complete, exam-oriented guide to the arterial supply of the entire body, organized by region, based on Gray's Anatomy for Students and the Thieme Atlas of Anatomy.
The Big Picture - The Aorta and Its Main Divisions
The aorta is the main arterial trunk. It has four parts:
| Part | Level | Key Branches |
|---|
| Ascending Aorta | From left ventricle to sternal angle | Right and left coronary arteries |
| Arch of Aorta | Behind manubrium sterni | Brachiocephalic trunk, L. common carotid, L. subclavian |
| Descending Thoracic Aorta | T4/5 to T12 | Posterior intercostals (3-11), subcostal, bronchial, oesophageal, pericardial, mediastinal |
| Abdominal Aorta | T12 to L4 | Celiac trunk, SMA, IMA, renals, suprarenal, gonads, phrenic, lumbars |
1. HEAD AND NECK
Common Carotid Artery
- Right: from Brachiocephalic trunk
- Left: directly from Arch of Aorta
- Divides at upper border of thyroid cartilage (C4 level) into:
External Carotid Artery (ECA) - supplies face, scalp, thyroid, pharynx
Branches (mnemonic: "Some Angry Lady Figured Out Pulses Must Stop Today"):
| Branch | Supply |
|---|
| Superior thyroid artery | Thyroid gland (upper), larynx |
| Ascending pharyngeal artery | Pharynx, meninges |
| Lingual artery | Tongue, floor of mouth |
| Facial artery | Face (from chin to medial angle of eye) |
| Occipital artery | Posterior scalp |
| Posterior auricular artery | Auricle, scalp behind ear |
| Maxillary artery (terminal) | Deep face, teeth, dura, palate, nose |
| Superficial temporal artery (terminal) | Scalp, parotid region |
Internal Carotid Artery (ICA) - supplies brain and orbit
- No branches in neck
- Enters carotid canal, passes through cavernous sinus
- Branches: ophthalmic artery, anterior choroidal artery, posterior communicating artery
- Terminates as: Anterior cerebral artery (ACA) + Middle cerebral artery (MCA)
Vertebral Artery (from 1st part of subclavian)
- Ascends through foramina transversaria C6-C1
- Passes through foramen magnum
- Right + left vertebrals unite to form Basilar Artery
- Basilar gives: anterior inferior cerebellar, superior cerebellar, posterior cerebral arteries
Circle of Willis
Connects ICA and vertebrobasilar systems:
- Anterior communicating artery (connects two ACAs)
- Anterior cerebral arteries (from ICA)
- Middle cerebral arteries (from ICA)
- Posterior communicating arteries (connect ICA to posterior cerebral)
- Posterior cerebral arteries (from basilar)
2. UPPER LIMB
Subclavian Artery - Branches (mnemonic: "VIT C D")
Arises from brachiocephalic trunk (right) or arch of aorta directly (left). Divided into 3 parts by the anterior scalene muscle.
1st part branches (medial to anterior scalene):
| Branch | Supply |
|---|
| Vertebral artery | Brain, cervical spinal cord |
| Internal thoracic (mammary) artery | Anterior chest wall, breast, pericardium |
| Thyrocervical trunk | Thyroid (inferior thyroid a.), scapular muscles (transverse cervical, suprascapular a.) |
2nd part branch (behind anterior scalene):
| Branch | Supply |
|---|
| Costocervical trunk | Posterior intercostals 1-2, deep neck muscles |
3rd part branch (lateral to anterior scalene):
| Branch | Supply |
|---|
| Dorsal scapular artery | Rhomboids, levator scapulae |
Axillary Artery (lateral border rib I to lower border pectoralis minor)
Divided into 3 parts by pectoralis minor:
| Part | Branches | Supply |
|---|
| 1st part (medial to pec minor) | Superior thoracic a. | Upper chest wall |
| 2nd part (behind pec minor) | Thoracoacromial a., Lateral thoracic a. | Pec muscles, deltoid, breast |
| 3rd part (lateral to pec minor) | Subscapular a. (subscapular, thoracodorsal, circumflex scapular), Anterior circumflex humeral a., Posterior circumflex humeral a. | Scapular region, shoulder joint, deltoid |
Mnemonic for axillary artery branches: "Send The Lord to Save A Patient" (Superior thoracic, Thoracoacromial, Lateral thoracic, Subscapular, Anterior circumflex humeral, Posterior circumflex humeral)
Brachial Artery (lower border pectoralis minor to cubital fossa)
- Lies medial to biceps, crossed by median nerve
- Profunda brachii (deep brachial a.) - winds around humerus in spiral groove with radial nerve; supplies posterior compartment; gives middle and radial collateral arteries
- Superior and inferior ulnar collateral arteries
- Divides at the neck of radius into radial and ulnar arteries
Radial Artery
- Passes to anatomical snuffbox, enters palm via 1st dorsal interosseous
- Deep palmar arch (mainly radial)
- Princeps pollicis, radialis indicis arteries
- Branches: radial recurrent (elbow anastomosis), dorsal carpal branch, palmar carpal branch
Ulnar Artery
- Larger of two terminal branches
- Passes with ulnar nerve in Guyon's canal
- Superficial palmar arch (mainly ulnar)
- Branches: anterior and posterior ulnar recurrent, common interosseous artery (divides into anterior and posterior interosseous), dorsal and palmar carpal branches
- Common and proper palmar digital arteries from superficial palmar arch to fingers
3. THORAX
Coronary Arteries (from ascending aorta, aortic sinuses)
| Artery | Origin | Main Supply |
|---|
| Right coronary artery (RCA) | Right aortic sinus | SA node (~60%), AV node (~80-90%), right atrium and ventricle, posterior IV septum (as posterior descending artery) |
| Left coronary artery (LCA) | Left aortic sinus | Divides into: |
| - Anterior interventricular (LAD) | LCA | Anterior LV, anterior IV septum, apex, bundle branches |
| - Circumflex artery | LCA | Left atrium, posterior-lateral LV, SA node (~40%) |
Thoracic Aorta Branches
- Posterior intercostal arteries (3rd-11th): ribs, intercostal muscles, spinal cord
- Subcostal arteries: below 12th rib
- Bronchial arteries (1-2 right, 2 left): lung parenchyma (nutritive)
- Oesophageal arteries: lower oesophagus
- Pericardial and mediastinal branches
- Superior phrenic arteries: upper surface of diaphragm
Internal Thoracic Artery (from subclavian)
- Gives anterior intercostal arteries (1st-6th spaces)
- Musculophrenic artery (continues to intercostals 7-9)
- Superior epigastric artery (anastomoses with inferior epigastric below)
4. ABDOMEN
Abdominal Aorta Branches - Classified by Type
Unpaired Anterior (Visceral) Branches:
| Artery | Vertebral Level | Supply (Gut Derivatives) |
|---|
| Celiac trunk | T12/L1 | Foregut (lower oesophagus to mid-duodenum): liver, stomach, spleen, pancreas, gallbladder |
| Superior mesenteric artery (SMA) | L1 | Midgut (mid-duodenum to 2/3 of transverse colon) |
| Inferior mesenteric artery (IMA) | L3 | Hindgut (distal 1/3 transverse colon to upper rectum) |
Celiac Trunk divides into:
- Left gastric artery - lesser curvature of stomach, lower oesophagus
- Common hepatic artery - gives hepatic artery proper (right and left hepatic), right gastric, gastroduodenal (superior pancreaticoduodenal, right gastroepiploic)
- Splenic artery - left gastroepiploic, short gastric arteries, pancreatic branches
SMA Branches:
- Inferior pancreaticoduodenal artery
- Intestinal branches (jejunal and ileal arteries, 15-18 in number)
- Ileocolic artery (cecum, appendix via appendicular artery, terminal ileum)
- Right colic artery (ascending colon)
- Middle colic artery (transverse colon)
IMA Branches:
- Left colic artery (descending colon)
- Sigmoid arteries (2-3 branches)
- Superior rectal artery (upper rectum)
Paired Lateral (Visceral) Branches:
| Artery | Level | Supply |
|---|
| Middle suprarenal arteries | L1 | Suprarenal gland (also supplied by superior suprarenal from inferior phrenic, inferior suprarenal from renal) |
| Renal arteries | L1-L2 | Kidneys; right is longer, passes behind IVC |
| Testicular/Ovarian arteries | L2 | Gonads |
Paired Posterior (Parietal) Branches:
| Artery | Supply |
|---|
| Inferior phrenic arteries (paired, first branches) | Under surface of diaphragm, suprarenal gland (superior suprarenal branch) |
| Lumbar arteries (4 pairs) | Posterior abdominal wall, spinal cord |
| Median sacral artery | Sacrum and coccyx (unpaired, terminal) |
Terminal Branches (at L4):
- Right and Left Common Iliac arteries (each divide into Internal and External Iliac)
5. PELVIS
Internal Iliac Artery (Hypogastric Artery)
Divides into anterior and posterior trunks.
Anterior Division Branches (UMBILICAL VESICAL UTERINE VAGINAL OBTURATOR INTERNAL PUDENDAL INFERIOR GLUTEAL):
| Branch | Supply |
|---|
| Umbilical artery (medial umbilical ligament in adult) | Superior vesical - upper bladder |
| Inferior vesical (males) / Vaginal (females) | Lower bladder, prostate, seminal vesicles / vagina |
| Uterine artery | Uterus, vagina, fallopian tube |
| Middle rectal artery | Middle rectum |
| Obturator artery | Medial thigh (adductors), hip joint |
| Internal pudendal artery | External genitalia, anal canal, perineum |
| Inferior gluteal artery | Gluteal region, posterior thigh |
Posterior Division Branches:
| Branch | Supply |
|---|
| Iliolumbar artery | Iliacus, psoas, quadratus lumborum |
| Lateral sacral arteries | Sacral canal, dorsal sacrum |
| Superior gluteal artery | Gluteal muscles (largest branch of internal iliac) |
External Iliac Artery
- Inferior epigastric artery (anastomoses with superior epigastric; forms lateral boundary of Hesselbach's triangle)
- Deep circumflex iliac artery (anterior abdominal wall, iliac crest)
- Becomes Femoral artery as it passes under inguinal ligament (midpoint of inguinal ligament)
6. LOWER LIMB
Femoral Artery (in femoral triangle, then adductor canal)
- Profunda femoris (Deep femoral artery) - main supply to thigh; branches:
- Medial circumflex femoral artery (femoral head - main supply via retinacular arteries)
- Lateral circumflex femoral artery (3 branches: ascending, descending, transverse)
- Perforating arteries (1st, 2nd, 3rd, 4th) - posterior thigh compartment
- Superficial branches: superficial epigastric, superficial circumflex iliac, superficial external pudendal arteries
- Descending genicular artery (before entering adductor hiatus)
- Passes through adductor hiatus to become Popliteal artery
Popliteal Artery (behind knee in popliteal fossa)
- Superior lateral and medial genicular arteries
- Middle genicular artery (to ACL, PCL)
- Inferior lateral and medial genicular arteries
- These form the Genicular (peripatellar) anastomosis
- Divides at lower border of popliteus into:
- Anterior tibial artery
- Posterior tibial artery (+ fibular/peroneal artery from upper part)
Anterior Tibial Artery
- Enters anterior compartment through interosseous membrane
- Descends on interosseous membrane with deep peroneal nerve
- Becomes Dorsalis Pedis artery at ankle (palpated between EHL and EDL tendons)
- Branches of dorsalis pedis: medial and lateral tarsal, arcuate artery (dorsal metatarsal arteries), deep plantar branch (completes plantar arch)
Posterior Tibial Artery
- Descends in posterior compartment with tibial nerve
- Fibular (Peroneal) artery - largest branch; supplies peroneal muscles, calcaneal branches
- Medial calcaneal branches
- Passes behind medial malleolus under flexor retinaculum
- Divides into Medial plantar artery and Lateral plantar artery
Plantar Arteries
| Artery | Supply |
|---|
| Medial plantar artery | Medial sole, hallux |
| Lateral plantar artery | Lateral sole; forms Deep plantar arch (with dorsal pedis) |
- Deep plantar arch gives plantar metatarsal arteries → common and proper plantar digital arteries
7. KEY ANASTOMOSES (High-Yield for Exams)
| Anastomosis | Arteries Involved | Importance |
|---|
| Circle of Willis | ACA, MCA, PCA, communicating arteries | Cerebral collateral circulation |
| Scapular anastomosis | Suprascapular + circumflex scapular + dorsal scapular | Collateral when subclavian/axillary blocked |
| Elbow anastomosis | Profunda brachii (collaterals) + radial/ulnar recurrent | Collateral when brachial artery tied |
| Palmar arches | Radial + ulnar arteries | Dual supply to hand |
| Epigastric anastomosis | Superior + inferior epigastric (internal thoracic/femoral) | Collateral for aortic coarctation |
| Cruciate anastomosis | Medial/lateral circumflex femoral + inferior gluteal + 1st perforator | Collateral for femoral artery |
| Genicular anastomosis | 5 genicular arteries + descending genicular + anterior recurrent tibial | Collateral around knee |
| Marginal artery of Drummond | SMA + IMA branches | Continuous along colon margin |
| Rectal anastomosis | Superior rectal (IMA) + middle rectal (internal iliac) + inferior rectal (pudendal) | Anastomosis around rectum |
8. SPINAL CORD BLOOD SUPPLY
| Artery | Origin | Supply |
|---|
| Anterior spinal artery | Two vertebral arteries unite | Anterior 2/3 of cord (one vessel) |
| Posterior spinal arteries (paired) | Vertebral or posterior inferior cerebellar | Posterior 1/3 of cord |
| Radicular arteries | Posterior intercostals, lumbar, lateral sacral | Reinforce spinal arteries at each level |
| Artery of Adamkiewicz | Usually T9-L2 (left side, 80%) | Major reinforcement of anterior spinal artery in thoracolumbar region |
Quick Memory Tips for Exams
- ECA branches: "Some Angry Lady Found Our Parrot Mad Shaking" (Superior thyroid, Ascending pharyngeal, Lingual, Facial, Occipital, Posterior auricular, Maxillary, Superficial temporal)
- Subclavian branches: VIT CD (Vertebral, Internal thoracic, Thyrocervical trunk, Costocervical trunk, Dorsal scapular)
- Abdominal aorta unpaired branches: Celiac (T12), SMA (L1), IMA (L3) - "3 - 1 - 3" vertebral levels
- Abdominal aorta paired branches: "I Rear Gut" - Inferior phrenic, Renal, Gonadal (testicular/ovarian)
- Celiac trunk: "Left Hand Squeeze" - Left gastric, Hepatic common, Splenic
- Profunda femoris supplies the thigh; Popliteal supplies the knee; Dorsalis pedis supplies dorsum of foot; Lateral plantar forms the plantar arch
Sources: Gray's Anatomy for Students (9780323934237); Thieme Atlas of Anatomy - General Anatomy and Musculoskeletal System (9781626237186)