Master Anatomy
for FMGE

What the FMGE Tests in Anatomy

The FMGE Anatomy paper tests applied, clinically relevant anatomy rather than pure recall. Candidates must demonstrate the ability to correlate structural knowledge with surgical approaches, radiological anatomy, and common clinical presentations. Expect questions on nerve injuries (e.g., Erb-Duchenne palsy, Klumpke's paralysis), arterial pulses and their absence in peripheral vascular disease, surface marking for procedures like lumbar puncture and thoracocentesis, and anatomical basis of fractures (e.g., Colles', Smith's, supracondylar). Emphasis is on embryological anomalies (e.g., tracheoesophageal fistula, congenital diaphragmatic hernia) and cross-sectional anatomy as seen on CT/MRI. Questions often present a clinical scenario requiring identification of the structure involved or the safest anatomical approach.

High-Yield Concepts

• Brachial Plexus Injuries: Erb-Duchenne palsy (C5-C6) presents with waiter's tip deformity: loss of shoulder abduction, elbow flexion, and forearm supination. Klumpke's paralysis (C8-T1) causes claw hand with loss of intrinsic hand muscles. First-line imaging: MRI brachial plexus. Management includes physiotherapy and possible nerve graft if no recovery by 3-6 months.
• Femoral Triangle and Hernia: Femoral hernia emerges below and lateral to the pubic tubercle (vs. inguinal hernia above and medial). Boundaries: superior (inguinal ligament), medial (lateral border of adductor longus), lateral (sartorius). Risk of strangulation is high; first-line treatment is open or laparoscopic mesh repair. Key landmark: femoral pulse is palpable just inferior to the midpoint of the inguinal ligament.
• Circle of Willis and Stroke Syndromes: Complete circle present in only 20-30%. Anterior cerebral artery occlusion causes contralateral leg > arm weakness. Middle cerebral artery occlusion causes contralateral face and arm weakness, with global aphasia if dominant hemisphere. Posterior communicating artery aneurysm presents with ipsilateral oculomotor nerve palsy (CN III) and contralateral hemiparesis. CT head without contrast is first-line for acute haemorrhage.
• Lumbar Puncture Anatomy: Needle inserted at L3-L4 or L4-L5 interspace (adults) to avoid spinal cord (terminates at L1-L2). Layers traversed: skin, subcutaneous tissue, supraspinous ligament, interspinous ligament, ligamentum flavum, epidural space, dura mater, arachnoid mater. CSF opening pressure: 10-20 cm H2O. Contraindications: raised intracranial pressure (risk of coning), coagulopathy (INR >1.4).
• Carpal Tunnel Syndrome: Median nerve compression at wrist under flexor retinaculum. Symptoms: nocturnal paraesthesia in thumb, index, middle, and half of ring finger; thenar wasting in chronic cases. Phalen's test (flexion for 60 sec reproduces symptoms) and Tinel's sign (tapping over nerve). First-line: night splint in neutral position; corticosteroid injection if persistent. Cut-off for nerve conduction: distal motor latency >4.2 ms.
• Portal Vein and Portosystemic Anastomoses: Portal hypertension (hepatic venous pressure gradient >5 mmHg, clinically significant >10 mmHg) leads to varices at four main sites: oesophageal (gastric left gastric vein to azygos), rectal (superior rectal to middle/inferior rectal), paraumbilical (to epigastric veins causing caput medusae), retroperitoneal (veins of Retzius). First-line for variceal bleeding: terlipressin, prophylactic antibiotics (ceftriaxone), and endoscopic band ligation within 12 hours.
• Fractures and Anatomical Deformities: Colles' fracture (distal radius, dorsal displacement) produces dinner fork deformity; median nerve injury risk. Smith's fracture (volar displacement) is reverse Colles'. Supracondylar fracture of humerus in children risks brachial artery injury (absent radial pulse) and median nerve injury; urgent reduction and fixation required. Scaphoid fracture presents with anatomical snuffbox tenderness; initial X-ray may be negative; treat with thumb spica cast if suspected and repeat X-ray at 2 weeks.
• Thoracic Outlet Syndrome: Compression of brachial plexus, subclavian artery, or vein in the interscalene triangle (between anterior and middle scalene muscles). Types: neurogenic (most common, C8-T1 distribution), venous (Paget-Schroetter syndrome, effort thrombosis), arterial. Adson's test: radial pulse diminishes with head rotation and deep inspiration. First-line: physiotherapy; surgical decompression (first rib resection) if refractory.

Common Traps in Anatomy Questions

• Confusing femoral hernia with inguinal hernia: remember femoral is below and lateral to the pubic tubercle, not above and medial.
• Thinking the spinal cord ends at L3 in adults; it terminates at L1-L2, so lumbar puncture is safe at L3-L4 or below.
• Assuming all wrist drop is radial nerve palsy; posterior interosseous nerve injury spares wrist extension but causes finger drop.
• Mixing up Erb-Duchenne (C5-C6, waiter's tip) with Klumpke (C8-T1, claw hand); Erb affects proximal arm, Klumpke affects hand.
• Forgetting that the median nerve does not supply the flexor carpi ulnaris; that is ulnar nerve, which also supplies the hypothenar muscles.

How to Revise Anatomy for the FMGE

Prioritise high-yield clinical anatomy: nerve injuries, fractures with eponyms, hernias, and vascular anatomy (circle of Willis, portal system). Focus on surface marking for common procedures (lumbar puncture, chest drain insertion at the 5th intercostal space midaxillary line). Questions often present a clinical vignette (e.g., a patient with foot drop after hip surgery) requiring identification of the injured nerve (sciatic vs. common peroneal). Practise interpreting X-rays and cross-sectional images (CT axial slices) for organ relationships. Use standard anatomy atlases (Netter, Gray's) and review embryology of common congenital anomalies (e.g., Meckel's diverticulum, patent ductus arteriosus). Avoid memorising rare variations; focus on structures with direct surgical or clinical relevance.

Practise it: MedLumen has 50 Anatomy questions for the FMGE, each with a full explanation and references.