using these images give question and answer for anatomy practical spotting and window dissection
Running Command
ls /tmp/workspace/attachments/b4370d61-2e88-4724-9a08-7a1619994e74/ && file "/tmp/workspace/attachments/b4370d61-2e88-4724-9a08-7a1619994e74/anat spotting.zip"
Running Command
mkdir -p /tmp/workspace/anat-spotting && unzip -o "/tmp/workspace/attachments/b4370d61-2e88-4724-9a08-7a1619994e74/anat spotting.zip" -d /tmp/workspace/anat-spotting/ && ls -la /tmp/workspace/anat-spotting/
Running Command
ls /tmp/workspace/anat-spotting/ | sort | nl
Running Command
cd /tmp/workspace/anat-spotting && python3 -m http.server 8765 &> /tmp/http_server.log & echo "Server PID: $!" && sleep 2 && curl -s -o /dev/null -w "%{http_code}" "http://localhost:8765/"
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Running Command
cd /tmp/workspace/anat-spotting && python3 -c " import os, base64 files = sorted(os.listdir('.')) for i, f in enumerate(files, 1): size = os.path.getsize(f) print(f'{i:02d}. {f} ({size} bytes)') "
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Here is the complete Anatomy Practical Spotting & Window Dissection Q&A based on all 28 images:
Anatomy Practical Spotting & Window Dissection - Q&A
SPOT 1 - Varicose Veins / Venous Ulcer (Bilateral Legs)
Image: Two views of lower legs with dark pigmented skin and an open ulcer at the medial malleolus.
Q1. What is shown in this image?
A: Varicose veins with a chronic venous (varicose) ulcer at the medial aspect of the lower leg/ankle.
Q2. At what site do venous ulcers typically occur and why?
A: They occur in the gaiter area, especially above the medial malleolus, because the long saphenous vein drains this region; incompetent perforating veins cause venous hypertension and skin breakdown.
Q3. Which vein is most commonly involved in varicose veins?
A: The great (long) saphenous vein, which drains into the femoral vein at the saphenofemoral junction just below the inguinal ligament.
Q4. What is the saphenofemoral junction and its clinical significance?
A: It is where the great saphenous vein joins the femoral vein, 3.5 cm below and lateral to the pubic tubercle. It is the most common site of incompetence causing varicosities.
Q5. Name the perforating veins that connect superficial to deep systems in the leg.
A: Cockett's perforators (in the lower leg) and Boyd's perforator (at the knee).
SPOT 2 - Wrist Drop (Radial Nerve Palsy)
Image: A forearm and hand with inability to extend the wrist - the wrist and fingers hang in a dropped position. Caption reads "Inability to lift wrist or fingers (extensor weakness AKA Wrist Drop)."
Q1. What deformity is shown?
A: Wrist drop - caused by injury to the radial nerve.
Q2. Which nerve is damaged in wrist drop?
A: The radial nerve (C5-C8), specifically its deep branch (posterior interosseous nerve) or the main trunk in the spiral groove of the humerus.
Q3. Where is the most common site of radial nerve injury?
A: In the spiral (radial) groove of the humerus (mid-shaft humeral fracture or "Saturday night palsy" from prolonged arm compression).
Q4. What muscles are paralyzed in wrist drop?
A: Extensor carpi radialis longus and brevis, extensor carpi ulnaris, extensor digitorum, and the other posterior compartment muscles of the forearm. In high radial nerve lesion, triceps is also affected.
Q5. What is Saturday night palsy?
A: Compression of the radial nerve in the spiral groove of the humerus when the arm is draped over a chair during deep sleep (intoxication), causing wrist drop.
SPOT 3 - Klumpke's Palsy (Claw Hand)
Image: Diagram showing claw hand deformity with labeled "Wasting of forearm muscles - Klumpke's palsy."
Q1. What deformity is shown?
A: Claw hand (main en griffe) due to Klumpke's palsy.
Q2. Which nerve roots are involved in Klumpke's palsy?
A: C8 and T1 (lower brachial plexus - Lower Brachial Plexus injury).
Q3. What is the mechanism of Klumpke's palsy?
A: Excessive upward traction on the limb (e.g., person grabbing a branch while falling, or obstetric maneuver) causing avulsion/stretching of C8 and T1 ventral rami.
Q4. What is the characteristic deformity and which muscles are lost?
A: Claw hand - hyperextension at MCP joints and flexion at IP joints, with wasting of intrinsic hand muscles (interossei, lumbricals, thenar/hypothenar muscles) supplied by T1.
Q5. Is Horner's syndrome associated, and why?
A: Yes - T1 injury may involve the sympathetic chain (cervicothoracic ganglion), causing Horner's syndrome: ptosis, miosis, anhidrosis, and enophthalmos on the ipsilateral side.
SPOT 4 - Down Syndrome (Clinical Features)
Image: Four panels - facial frontal view, lateral view, protruding tongue, and slanted eyes of a person with classic Down syndrome features.
Q1. What syndrome is depicted?
A: Down syndrome (Trisomy 21).
Q2. What are the facial features of Down syndrome visible here?
A: Flat broad face, upward slanting eyes (mongoloid slant), epicanthal folds, protruding/large tongue (macroglossia), small nose, and low-set ears.
Q3. What is the chromosomal basis?
A: Trisomy 21 - three copies of chromosome 21. Most commonly due to nondisjunction during meiosis.
Q4. What is the role of maternal age?
A: Incidence increases with maternal age due to higher frequency of meiotic nondisjunction; risk rises sharply above 35 years.
Q5. List systemic features of Down syndrome.
A: Intellectual disability, congenital heart defects (ASD, VSD, AVSD), duodenal atresia, Hirschsprung's disease, atlantoaxial instability, single palmar crease, sandal gap (wide space between 1st and 2nd toes).
SPOT 5 - Edwards Syndrome Karyotype (Trisomy 18)
Image: Karyotype with chromosome 18 circled in red - showing trisomy (3 copies of chromosome 18).
Q1. What syndrome does this karyotype represent?
A: Edwards syndrome - Trisomy 18.
Q2. What is the chromosomal abnormality?
A: Three copies of chromosome 18 (47 chromosomes total), most commonly due to nondisjunction.
Q3. What are the key clinical features of Edwards syndrome?
A: Low birth weight, clenched fists with overlapping fingers, rocker-bottom feet, micrognathia, prominent occiput (dolichocephaly), congenital heart defects (VSD, PDA), renal anomalies, short sternum.
Q4. What is the prognosis?
A: Very poor - most die within the first year of life; median survival is days to weeks.
Q5. What other trisomy syndromes must be distinguished?
A: Trisomy 21 (Down), Trisomy 13 (Patau - chromosome 13 circled, with holoprosencephaly and cleft palate), Trisomy 18 (Edwards).
SPOT 6 - Patau Syndrome Karyotype (Trisomy 13)
Image: Karyotype with chromosome 13 circled in red - three copies visible.
Q1. What syndrome does this karyotype represent?
A: Patau syndrome - Trisomy 13.
Q2. What are the cardinal features of Patau syndrome?
A: Holoprosencephaly (failure of forebrain to divide), cyclopia or hypotelorism, microcephaly, cleft lip and palate, polydactyly, rocker-bottom feet, congenital heart defects.
Q3. What is the prognosis?
A: Severe - most affected infants die within days to weeks; rarely survive beyond the first year.
SPOT 7 - Turner Syndrome Karyotype (45,X)
Image: Karyotype showing only one X chromosome (circled in red), labelled "XX" but with only a single X visible - consistent with 45,X Turner syndrome.
Q1. What syndrome does this karyotype show?
A: Turner syndrome - 45,X (monosomy X).
Q2. What are the clinical features shown in the diagram associated with Turner syndrome?
A: Short stature, webbed neck (pterygium colli), low posterior hairline, shield-shaped chest, widely spaced nipples, coarctation of aorta, gonadal dysgenesis (streak ovaries), no menstruation, shortened 4th metacarpal, cubitus valgus (elbow deformity).
Q3. What cardiac defect is most common in Turner syndrome?
A: Coarctation of the aorta and bicuspid aortic valve.
Q4. What is the gonadal abnormality?
A: Streak gonads (rudimentary ovaries) - fibrous bands replace ovarian tissue, leading to primary amenorrhea and infertility.
SPOT 8 - Down Syndrome Karyotype (Trisomy 21)
Image: Karyotype with chromosome 21 circled in red - three copies of chromosome 21 visible.
Q1. Name this karyotype.
A: Down syndrome - Trisomy 21 (47, XX/XY, +21).
Q2. What is the most common mechanism?
A: Non-disjunction during maternal meiosis I (95% of cases).
Q3. Name two other mechanisms of Down syndrome.
A: Robertsonian translocation (most common familial form, chromosome 21 attached to chromosome 14) and mosaicism (trisomy 21 in some cells only).
SPOT 9 - Unilateral Leg Swelling (DVT / Lymphoedema)
Image: Both lower limbs shown with one leg markedly swollen compared to the other.
Q1. What is depicted?
A: Unilateral lower limb swelling, consistent with deep vein thrombosis (DVT) or lymphoedema.
Q2. Which veins are most commonly involved in DVT of the lower limb?
A: The popliteal, femoral, and iliac veins. DVT most frequently originates in the calf (tibial veins) and propagates proximally.
Q3. What anatomical triangle contains the femoral vein?
A: The femoral triangle - bounded by the inguinal ligament (above), sartorius (lateral), and adductor longus (medial). The femoral vein lies medial to the femoral artery.
Q4. What is Virchow's triad?
A: Three factors predisposing to thrombosis: (1) Stasis of blood flow, (2) Endothelial injury, (3) Hypercoagulability.
Q5. Distinguish lymphoedema from DVT swelling.
A: DVT - pitting oedema, warmth, tenderness, positive Homan's sign; lymphoedema - non-pitting, starts distally, no warmth, associated with recurrent infections and skin changes (peau d'orange).
SPOT 10 - Varicose Veins (Leg - Tortuous Veins)
Image: Lower leg showing tortuous, dilated, rope-like superficial veins over the whole calf.
Q1. What is shown?
A: Varicose veins of the lower limb - tortuous, dilated superficial veins.
Q2. What is the underlying anatomical cause?
A: Incompetence of valves in the great or small saphenous vein or their communicating perforators, leading to retrograde blood flow and venous dilation.
Q3. What is the small saphenous vein and where does it drain?
A: It drains the back of the leg and foot, running behind the lateral malleolus, and empties into the popliteal vein in the popliteal fossa (saphenopopliteal junction).
Q4. What is Trendelenburg's test?
A: A clinical test for saphenofemoral incompetence - leg raised to empty veins, saphenofemoral junction compressed; if veins refill rapidly on releasing compression, the junction is incompetent.
SPOT 11 - Klumpke's Palsy / Brachial Plexus Injury Diagram
Image: Diagram showing UBP injury (Erb's palsy - C5, C6) on left and LBP injury (Klumpke's palsy - C8, T1) on right, with mechanisms illustrated.
Q1. What is Erb's palsy?
A: Upper brachial plexus injury involving C5 and C6 roots; caused by increased angle between neck and shoulder (e.g., difficult delivery, motorcycle fall).
Q2. What is the classic posture of Erb's palsy?
A: "Waiter's tip" position - arm hanging medially rotated and adducted, elbow extended, forearm pronated, wrist flexed. Deltoid, supraspinatus, infraspinatus, and biceps are predominantly paralyzed.
Q3. Which muscles are affected in Erb's palsy (C5/C6)?
A: Deltoid (axillary n.), supraspinatus & infraspinatus (suprascapular n.), biceps & brachialis (musculocutaneous n.), brachioradialis (radial n.).
Q4. Differentiate Erb's vs Klumpke's mechanism.
A: Erb's - downward traction/increased neck-shoulder angle (e.g., shoulder dystocia in delivery, falling on shoulder); Klumpke's - excessive upward pull of the limb (e.g., grabbing a branch, arm pulled forcefully upward in delivery).
SPOT 12 - Thenar Wasting / Carpal Tunnel (Both Hands)
Image: Palmar view of both hands showing thenar wasting (flattening of the thenar eminence), with blue arrows pointing to the area of wasting on both hands.
Q1. What is shown?
A: Bilateral thenar wasting, consistent with carpal tunnel syndrome (median nerve compression) or bilateral thenar muscle atrophy.
Q2. Which nerve is compressed in carpal tunnel syndrome?
A: The median nerve, at the wrist under the flexor retinaculum (transverse carpal ligament).
Q3. What muscles form the thenar eminence and which nerve supplies them?
A: Abductor pollicis brevis, opponens pollicis, and flexor pollicis brevis (superficial head) - all supplied by the recurrent (motor) branch of the median nerve.
Q4. What are the boundaries of the carpal tunnel?
A: Floor - carpal bones (scaphoid, trapezium, hamate, pisiform); Roof - flexor retinaculum (transverse carpal ligament). Contents: FDS (x4), FDP (x4), FPL, median nerve (9 tendons + 1 nerve).
Q5. What is the clinical test for carpal tunnel syndrome?
A: Phalen's test (wrist flexion for 60 sec reproduces symptoms) and Tinel's sign (percussion over carpal tunnel causes paraesthesia in median nerve distribution).
SPOT 13 - Facial Nerve Palsy (Unilateral Face)
Image: A man with unilateral facial involvement showing asymmetric smile and facial erythema/contusion, particularly around one eye.
Q1. What nerve injury is suggested?
A: Facial nerve (CN VII) injury, possibly traumatic, producing facial asymmetry.
Q2. Distinguish UMN vs LMN facial palsy.
A: UMN (e.g., stroke) - spares the upper face (forehead spared) because upper facial muscles have bilateral cortical representation; LMN (Bell's palsy, parotid trauma) - affects entire ipsilateral half of the face including forehead.
Q3. Where does the facial nerve exit the skull?
A: Through the stylomastoid foramen.
Q4. What structures are at risk when the facial nerve passes through the parotid gland?
A: The facial nerve divides within the parotid gland into temporal, zygomatic, buccal, marginal mandibular, and cervical branches. Parotid surgery risks facial nerve injury.
Q5. What is Bell's palsy?
A: Idiopathic LMN facial nerve palsy, most commonly caused by herpes simplex virus reactivation in the geniculate ganglion, affecting the entire ipsilateral face.
SPOT 14 - Klinefelter Syndrome Karyotype (47, XXY)
Image: Karyotype showing three sex chromosomes - X, X, Y (circled in red).
Q1. What syndrome does this karyotype show?
A: Klinefelter syndrome - 47, XXY.
Q2. What are the clinical features of Klinefelter syndrome (as shown in diagram)?
A: Tall stature, slightly feminized physique, small testes (hypogonadism), azoospermia/infertility, breast development (gynecomastia in ~30%), female-type pubic hair pattern, poor beard growth, osteoporosis, mildly reduced IQ.
Q3. What is the underlying hormonal abnormality?
A: Primary hypogonadism - low testosterone, elevated FSH and LH (hypergonadotropic hypogonadism).
Q4. What is the risk of this syndrome?
A: Breast cancer risk is 20x higher than normal males; also predisposed to autoimmune disorders and mediastinal germ cell tumors.
SPOT 15 - Infant with Cleft Lip
Image: A baby's face with a visible cleft involving the lip (unilateral cleft lip).
Q1. What developmental anomaly is shown?
A: Unilateral cleft lip (cheiloschisis).
Q2. What is the embryological basis of cleft lip?
A: Failure of fusion of the medial nasal process with the maxillary process during the 6th-7th week of embryonic development.
Q3. Distinguish cleft lip from cleft palate.
A: Cleft lip - failure of maxillary and medial nasal process fusion (anterior to incisive foramen); Cleft palate - failure of fusion of the two palatal shelves (posterior to incisive foramen); they can occur independently or together.
Q4. Which side is cleft lip more common?
A: Left side is more commonly affected. Unilateral is more common than bilateral.
SPOT 16 - Neonatal Umbilical Swelling (Omphalocele/Exomphalos)
Image: Newborn infant with a large abdominal wall defect at the umbilicus - a sac containing intestinal contents protruding at the umbilicus, consistent with omphalocele.
Q1. What is the developmental defect shown?
A: Omphalocele (exomphalos) - failure of the intestines to return to the abdominal cavity after physiological herniation between the 6th-10th week of gestation. The sac is covered by peritoneum and amnion.
Q2. Distinguish omphalocele from gastroschisis.
A: Omphalocele - midline defect at umbilicus, covered by peritoneal-amniotic sac, associated with other anomalies (trisomy, cardiac defects); Gastroschisis - paraumbilical defect (usually right), NOT covered by sac, bowel exposed, less associated with other anomalies.
Q3. What is the embryological basis?
A: During week 6, intestines herniate into the umbilical cord; they normally return by week 10. Failure of return = omphalocele.
Q4. What other neonatal abdominal swellings are in the differential?
A: Umbilical hernia (smaller, covered by skin, commonly closes spontaneously), gastroschisis, urachal cyst, Meckel's diverticulum-related swelling.
SPOT 17 - Neonatal Umbilical Stump with Omphalitis / Umbilical Granuloma
Image: Close-up of a newborn umbilicus showing a red, moist, granulomatous mass at the umbilical stump with clamp.
Q1. What is shown?
A: Umbilical granuloma - a persistent granulation tissue at the umbilical stump after cord separation.
Q2. What is the normal anatomy of the umbilical cord?
A: Contains two umbilical arteries (carry deoxygenated blood from fetus to placenta) and one umbilical vein (carries oxygenated blood from placenta to fetus), embedded in Wharton's jelly.
Q3. What is a single umbilical artery and its significance?
A: Presence of only one umbilical artery (instead of two) is associated with renal anomalies and chromosomal defects (trisomy 18 and 13).
Q4. What is a patent urachus?
A: Failure of the urachus (allantois remnant connecting bladder to umbilicus) to close, resulting in urine leaking from the umbilicus.
SPOT 18 - Achondroplasia/Achondroplastic Fetus
Image: A malformed fetus (still birth/cadaver) showing shortened limbs, large head, and abnormal body proportions - consistent with achondroplasia or a severe skeletal dysplasia.
Q1. What condition does this fetus suggest?
A: Achondroplasia (most common cause of dwarfism) or a severe skeletal dysplasia. Shows rhizomelic shortening of limbs (proximal > distal) with relatively large head.
Q2. What is the genetic basis of achondroplasia?
A: Autosomal dominant mutation in the FGFR3 gene (fibroblast growth factor receptor 3), located on chromosome 4p. Most cases are de novo mutations.
Q3. What is the mechanism of shortened limbs?
A: FGFR3 is normally inhibitory to chondrocyte proliferation; the gain-of-function mutation constitutively activates FGFR3, inhibiting endochondral ossification at the growth plate.
Q4. What are features of achondroplasia?
A: Rhizomelic dwarfism, macrocephaly, frontal bossing, midface hypoplasia, trident hand, lumbar lordosis, normal intelligence.
SPOT 19 - Down Syndrome Features Diagram
Image: Labeled diagram of a Down syndrome infant showing: Growth failure, mental retardation, flat back of head, abnormal ears, many loops on fingertips, palm crease, special skin ridge patterns, unilateral/bilateral absence of one rib, intestinal blockage, umbilical hernia, abnormal pelvis, diminished muscle tone, broad flat face, slanting eyes, epicanthal fold, short nose, short and broad hands, small arched palate, big wrinkled tongue, dental anomalies, congenital heart disease, enlarged colon, big toes widely spaced.
Q1. What is the single palmar crease (simian crease)?
A: A single transverse crease across the palm (replacing the normal two palmar creases), seen in ~50% of Down syndrome patients. Also occasionally seen in normal individuals.
Q2. What intestinal anomaly is shown?
A: Duodenal atresia ("double bubble" sign on X-ray) and Hirschsprung's disease (enlarged colon) are associated with Down syndrome.
Q3. What cardiac defects are associated with Down syndrome?
A: Atrioventricular septal defect (AVSD/endocardial cushion defect) is the most characteristic. Also VSD, ASD, PDA.
SPOT 20 - Turner Syndrome Features Diagram
Image: Labeled diagram of Turner syndrome showing: Short stature, low hairline, fold of skin (webbed neck), shield-shaped thorax, widely spaced nipples, shortened metacarpal IV, small fingernails, constriction of aorta, poor breast development, elbow deformity (cubitus valgus), rudimentary ovaries/gonadal streak, no menstruation, brown spots (nevi).
Q1. What is the karyotype of Turner syndrome?
A: 45,X (monosomy X) - only one functional X chromosome.
Q2. What is a webbed neck?
A: Pterygium colli - redundant skin folds on the neck extending from mastoid to acromion, caused by fetal lymphoedema (cystic hygroma that resolved).
Q3. What is the most common cause of primary amenorrhea?
A: Turner syndrome (45,X) is the most common chromosomal cause of primary amenorrhea. Other causes include Mullerian agenesis, androgen insensitivity syndrome.
Q4. Which metacarpal is shortened?
A: The 4th metacarpal - creates a distinctive knuckle sign (dimple when fist made) and metacarpal shortening on X-ray.
SPOT 21 - Klinefelter Syndrome Clinical Diagram
Image: Labeled body diagram showing: Tall stature, slightly feminized physique, mildly impaired IQ, tendency to lose chest hairs, female-type pubic hair pattern, frontal baldness absent, poor beard growth, breast development in 30%, osteoporosis, small testes.
Q1. What is the pathophysiology of gynecomastia in Klinefelter syndrome?
A: Low testosterone leads to relatively high estrogen/testosterone ratio, stimulating breast gland development.
Q2. What is the fertility status?
A: Almost all 47, XXY males are infertile due to azoospermia from testicular tubular atrophy (hyalinization of seminiferous tubules). Some 46,XY/47,XXY mosaics may have residual fertility.
Q3. What lab findings are expected?
A: Elevated FSH and LH (hypergonadotropic), low testosterone, azoospermia on semen analysis.
SPOT 22 - Umbilical Swelling in Neonate / Omphalocele (Clinical Photo)
Image: Close-up photo of a neonate's umbilical region with a bulging sac containing organs.
(See Spot 16 for detailed Q&A on omphalocele)
Q1. What structures can herniate into an omphalocele?
A: Small bowel, large bowel, stomach, and even liver in large defects.
Q2. What syndromes are associated with omphalocele?
A: Beckwith-Wiedemann syndrome (macroglossia, macrosomia, hypoglycemia), Trisomy 18, Trisomy 13, Pentalogy of Cantrell.
SPOT 23 - Neonatal Cephalohematoma / Caput Succedaneum
Image: Newborn baby with a swelling over the scalp (upper left area).
Q1. What scalp swelling is shown?
A: Cephalohematoma - a subperiosteal collection of blood, limited by suture lines (does not cross sutures).
Q2. Distinguish cephalohematoma from caput succedaneum.
A: Caput succedaneum - oedematous swelling of the scalp ABOVE the periosteum; crosses suture lines; resolves in days; Cephalohematoma - SUBPERIOSTEAL haematoma; does NOT cross suture lines; takes weeks to resolve; risk of jaundice.
Q3. What is a subgaleal hematoma?
A: Collection of blood between the galea aponeurotica and the periosteum; CROSSES suture lines; can be life-threatening due to large potential space.
Q4. Name the layers of the scalp (mnemonic).
A: SCALP - Skin, dense Connective tissue, Aponeurosis (galea), Loose areolar tissue (dangerous layer), Pericranium (periosteum). The "dangerous layer" allows infection/bleeding to spread widely.
SPOT 24 - Down Syndrome Profile / Side View
Image: Two boys shown in profile - consistent with Down syndrome (flat occiput, open mouth posture, protruding tongue).
Q1. What is the occiput abnormality in Down syndrome?
A: Flat occiput (brachycephaly) - due to underdevelopment of the posterior fossa bones.
Q2. What is Brushfield spots?
A: Light-colored spots on the iris periphery seen in Down syndrome - a useful clinical sign.
SPOT 25 - Infant with Cleft Lip (Clinical)
Image: An infant with bilateral cleft lip visible.
Q1. What are the complications of unrepaired cleft lip/palate?
A: Feeding difficulties, recurrent ear infections (Eustachian tube dysfunction), speech problems, dental malocclusion, psychosocial issues.
Q2. What is the blood supply to the palate?
A: Greater palatine artery (from maxillary artery) for the hard palate; lesser palatine artery for the soft palate; ascending palatine artery (from facial artery) supplements soft palate.
SPOT 26 - Hydrocephalus (Neonatal)
Image: Infant with a markedly enlarged, globular cranium, "sunset" eye sign (eyes deviated downward), tense anterior fontanelle.
Q1. What condition is shown?
A: Hydrocephalus - abnormal accumulation of CSF in the cerebral ventricles.
Q2. What is the "sunset sign"?
A: Downward deviation of the eyes due to pressure on the superior colliculi, seen in obstructive hydrocephalus.
Q3. What is the circulation of CSF?
A: Produced by choroid plexus in lateral ventricles → foramen of Monro → 3rd ventricle → cerebral aqueduct (of Sylvius) → 4th ventricle → foramina of Magendie and Luschka → subarachnoid space → reabsorbed by arachnoid granulations into dural venous sinuses.
Q4. What is the most common obstructive site in congenital hydrocephalus?
A: Aqueduct of Sylvius (stenosis/obstruction) - causes non-communicating (obstructive) hydrocephalus.
Q5. Distinguish communicating from obstructive hydrocephalus.
A: Obstructive - CSF flow blocked within ventricular system; Communicating - CSF flow blocked at arachnoid granulations (e.g., post-meningitis, subarachnoid haemorrhage) - all ventricles dilate.
SPOT 27 - Placenta (Wet Specimen)
Image: A glass jar/tray containing a placenta specimen with umbilical cord labeled "PLACENTA."
Q1. What is shown?
A: A full-term placenta with umbilical cord - a window dissection specimen.
Q2. Describe the structure of the placenta.
A: Discoid organ, ~500g at term, 20-22 cm diameter, 2-3 cm thick. Has a maternal surface (rough, lobulated cotyledons, decidua basalis) and a fetal surface (smooth, covered by chorion, umbilical vessels radiate from cord insertion).
Q3. What are the components of the placental barrier?
A: Syncytiotrophoblast, cytotrophoblast (early pregnancy), trophoblastic basement membrane, villous connective tissue, fetal capillary basement membrane, fetal capillary endothelium.
Q4. What structures are in the umbilical cord?
A: Two umbilical arteries (carry deoxygenated blood), one umbilical vein (carries oxygenated blood), Wharton's jelly (mucoid connective tissue), covered by amniotic epithelium. Normal length: 50-60 cm.
Q5. What is a succenturiate lobe?
A: An accessory lobe of placenta connected to the main placenta by blood vessels - clinically important as it can be retained after delivery causing post-partum haemorrhage.
Q6. What is battledore placenta?
A: Marginal insertion of the umbilical cord (normally central/eccentric). Velamentous insertion (into membranes) is more dangerous as unprotected vessels can rupture (vasa praevia).
SPOT 28 - Anencephaly (Preserved Fetal Specimen)
Image: A preserved fetal specimen in a jar labeled "ANENCEPHALY" - fetus without a calvarium, brain exposed on the surface, frog-like face with bulging eyes, chin continuous with chest due to absent neck.
Q1. What is shown?
A: Anencephaly - a neural tube defect where the brain and cranial vault fail to develop.
Q2. What is the embryological basis of anencephaly?
A: Failure of closure of the anterior (rostral) neuropore at day 24-26 of development, preventing development of the forebrain and calvarium.
Q3. What is the relationship between folic acid and anencephaly?
A: Folic acid deficiency increases risk of neural tube defects including anencephaly; periconceptional folic acid supplementation (400-800 micrograms/day) significantly reduces risk.
Q4. What are the clinical features of anencephaly?
A: Brain exposed on surface (exencephaly), absent calvarium (acrania), bulging eyes (due to no supraorbital rim), absent neck (chin continuous with chest), absence of cerebral hemispheres; brainstem may be present. Incompatible with life.
Q5. What is alpha-fetoprotein (AFP)?
A: Protein produced by the fetal liver and yolk sac; elevated in maternal serum and amniotic fluid in open neural tube defects (anencephaly, spina bifida aperta). Used in prenatal screening (triple/quad screen).
Q6. What other neural tube defects should be known?
A: - Spina bifida occulta - incomplete vertebral arch, covered by skin, no sac; - Meningocele - spinal meninges herniate through defect, no neural tissue; - Meningomyelocele - meninges + spinal cord herniate, serious neurological deficits; - Encephalocele - brain herniates through skull defect.
Summary Table
| Spot | Diagnosis | Key Anatomy |
|---|---|---|
| 1 | Varicose veins / Venous ulcer | Great saphenous vein, perforators |
| 2 | Wrist drop | Radial nerve, spiral groove |
| 3 | Klumpke's palsy | C8/T1, lower brachial plexus |
| 4 | Down syndrome (clinical) | Trisomy 21 features |
| 5 | Edwards syndrome karyotype | Trisomy 18 |
| 6 | Patau syndrome karyotype | Trisomy 13 |
| 7 | Turner syndrome karyotype | 45,X |
| 8 | Down syndrome karyotype | Trisomy 21 |
| 9 | DVT / Lymphoedema | Femoral vein, Virchow's triad |
| 10 | Varicose veins (tortuous) | Saphenous veins, perforators |
| 11 | Erb's + Klumpke's palsy diagram | Brachial plexus C5-T1 |
| 12 | Carpal tunnel / Thenar wasting | Median nerve, flexor retinaculum |
| 13 | Facial nerve palsy | CN VII, stylomastoid foramen |
| 14 | Klinefelter karyotype | 47,XXY |
| 15 | Cleft lip (infant) | Maxillary-nasal process fusion |
| 16 | Omphalocele (neonatal) | Umbilical ring, midgut rotation |
| 17 | Umbilical granuloma | Umbilical cord anatomy |
| 18 | Achondroplastic fetus | FGFR3, endochondral ossification |
| 19 | Down syndrome diagram | Systemic features |
| 20 | Turner syndrome diagram | Gonadal streak, coarctation |
| 21 | Klinefelter diagram | Hypogonadism |
| 22 | Omphalocele (clinical) | Beckwith-Wiedemann |
| 23 | Cephalohematoma | Scalp layers (SCALP) |
| 24 | Down syndrome profile | Brachycephaly, Brushfield spots |
| 25 | Cleft lip (clinical) | Palatine vessels |
| 26 | Hydrocephalus | CSF circulation, aqueduct |
| 27 | Placenta (specimen) | Placental structure, cord anatomy |
| 28 | Anencephaly (specimen) | Anterior neuropore, AFP |
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