Aponeurosis Anatomy Question Bank — Forearm, OmpathStudy

Continued from $1. Forearm, Wrist & Hand Q150: (a) Name the terminal branches of the radial artery. (b) Describe the surface landmark of the deep palmar arch Answer: Radialis indicis artery Princeps pollicis artery Together these form the deep palmar arch Surface landmark: fully extend the thumb and draw a line across the palm from the distal border of the thumb — this marks the level of the superficial palmar arch (Boeckel's line) The deep palmar arch lies about a finger's width proximal to this line --- Q151: Identify A, B, C; clinical utility of X Answer: A — abductor pollicis longus B — extensor pollicis brevis C — extensor pollicis longus Clinical utility of X (the anatomical snuffbox): site of the radial pulse; overlies the scaphoid, so tenderness here suggests a scaphoid fracture --- Q152: Identify A and G; terminal branches of the radial artery Answer: A — scaphoid G — capitate Terminal branches of the radial artery: princeps pollicis artery; radialis indicis artery --- Q153: Wrist radiograph — identify A and B; two actions of the hand lumbricals (2+2 marks) Answer: A — wrist joint (radiocarpal joint line) B — capitate Two actions of the hand lumbricals: flexion of the metacarpophalangeal joints; extension of the interphalangeal joints --- Q154: Palm dissection — nerve supply to muscle A; identify B and C (2+2 marks) Answer: Nerve supply to muscle A (thenar muscles): recurrent branch of the median nerve B — flexor digitorum profundus tendon C — palmar aponeurosis --- Q155: (a) Identify the structure circled and its two components. (b) Describe its blood supply pattern and a related clinical point Answer: Extensor expansion (extensor hood) of the finger Components: extensor digitorum tendon Components: lumbrical tendon Blood supply pattern: distoproximal, from the pulp rete Clinical point: avascular necrosis risk in pulp infections (felon) --- Q156: Identify structures 3, 4, 5 and 7 Answer: 3: pisiform 4: trapezium 5: trapezoid 7: hamate Remaining carpal bones for full recall: scaphoid, lunate, triquetrum, capitate --- Q157: Name the structures A, B, C and D Answer: A: pronator quadratus B: median nerve C: anterior interosseous nerve D: anterior interosseous nerve — accompanying vessels/second branch shown Anterior interosseous nerve is a branch of the median nerve --- Q158: Name the terminal branches of the structure below Answer: Radial artery Princeps pollicis artery Radialis indicis artery Deep palmar arch Compare: the superficial palmar arch is formed mainly by the ulnar artery --- Q159: Identify the muscle tagged and its action Answer: Brachioradialis Action: flexes the elbow joint Action: supinates the forearm from a pronated position (to neutral/mid-flexed) Innervation: radial nerve --- Q160: State the communications of the space labelled X Answer: Web space (interdigital) Proximally continuous with the space of Parona at the wrist/forearm Related deep space: the midpalmar space, which drains via the lumbrical canals to the same web spaces --- Q161: Identify the nerve below and its nerve roots Answer: Radial nerve Roots: C5, C6, C7, C8, T1 --- Q162: Name the branches of the structure labelled X Answer: Ulnar artery Common interosseous artery Divides into anterior and posterior interosseous arteries Ulnar recurrent artery --- Q163: Identify the tagged bone and a muscular attachment to it Answer: Pisiform Flexor carpi ulnaris tendon attaches here Also gives origin to abductor digiti minimi --- Q164: State two actions of the tagged muscle Answer: Lumbricals Extend the interphalangeal joints Flex the metacarpophalangeal joints Lateral two are supplied by the median nerve, medial two by the ulnar nerve --- Q165: Identify the muscle below and its innervation Answer: Abductor pollicis brevis Innervation: recurrent branch of the median nerve --- Q166: State (a) the site of entrapment of the nerve below at the wrist, (b) its nerve roots Answer: Ulnar nerve (a) Site: Guyon's canal (b) Roots: C7, C8, T1 --- Q167: State 4 sites of entrapment of A Answer: A: ulnar nerve Arcade of Struthers Medial intermuscular septum Cubital tunnel (behind the medial epicondyle, between the two heads of flexor carpi ulnaris) Guyon's canal at the wrist Ulnar nerve root value: C8, T1 --- Q168: Identify structures 3, 4, 5 and 7 Answer: 3: triquetrum 4: trapezium 5: trapezoid 7: hamate Remaining carpal bones for full recall: scaphoid, lunate, capitate, pisiform Mnemonic (proximal to distal, lateral to medial): "Some Lovers Try Positions That They Cannot Handle" --- Q169: Name the structures A, B, C and D Answer: A: median nerve B: a branch of the musculocutaneous nerve (lateral cutaneous nerve of forearm), or brachial vessels at the elbow C, D: cutaneous branches/vessels of the forearm Note: verify letters against the source image before publishing --- Q170: Name the terminal branches of the structure below Answer: Superficial palmar arch Formed mainly by the ulnar artery Three common palmar digital arteries One proper palmar