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Hand Anatomy
Quiz
Date : 10/01/2022
Hand Anatomy Quiz Question 1Which tendon flexed the interphalangeal joint of the thumb? A) Flexor digitorum profundusB) Flexor digitorum superficialis C) Opponens pollicis D) Abductor pollicis longusE) Flexor pollicis longus Flexor pollicis longus flexes the interphalangeal joint of the thumb, and arises from the radius and interosseus membrane. The muscle is innervated by the median nerve. >/p>Question 2Which tendon flexes the distal interphalangeal joint of the ulnar 4 digits? A) Flexor digitorum superficialis B) LumbricalsC) Dorsal interosseiD) Extensor digiti minimiE) Flexor digitorum profundus Flexor digitorum profundus flexes the distal interphalangeal joint of the ulnar four digits. It arises from the ulna and interosseus membrane and is innervated by both the median and ulnar nerves. Question 3Which group of muscles cause abduction of the fingers? A) Palmar interosseiB) Dorsal interosseiC) LumbricalsD) Flexor digitorum superficialisE) thenar eminence An easy way to remember the action of the interosseus muscles of the hand is PADDAB i.e. Palmar interossei adductionDorsal interossei abductionThe interossei are innervated by the ulnar nerve. Question 4Which artery forms the superficial palmar arch? A) Radial arteryB) Medial arteryC) Brachial arteryD) Axillary arteryE) Ulnar artery The ulnar artery continues to form the superficial palmar arch. The common digital arteries arises from the superficial palmar arch with contribution from the deep palmar arch. The common digital arteries then divide to form the proper digital arteries which run along the sides of the fingers. The thumb gains the majority of its blood supply from the deep palmar arch and is the exception. Question 5The radial artery enters the hand by passing between the two heads of which muscle? A) First lumbricalB) extensor digitorumC) First dorsal interosseusD) Thenar eminence E) Palmar interossei The radial artery forms the deep palmar arch in the hand, which is not as important as the superficial palmar arch. The deep palmar arch gives off the radialis indicis artery (supplying the radial side of the index finger), and the princeps pollicis artery, supplying the thumb. Question 6Which nerve supplies the muscles of the thenar eminence? A) Ulnar nerveB) Radial nerveC) Axillary nerveD) Dorsal sensory branch of the ulnar nerveE) Recurrent motor branch of the median nerve The median nerve gives of muscular branches to the majority of the forearm muscles. It also gives of the palmar cutaneous branch which supplies sensation to the proximal aspect of the palm. The median nerve also gives rise to the recurrent motor branch which supplies the muscles of the thenar eminence, with the exception of one muscle... Question 7Which is the only thenar muscle which is not supplied by the above nerve? A) Opponens pollicisB) Adductor pollicisC) Abductor pollicis brevisD) Flexor pollicis brevisE) Abductor pollicis longus Adductor pollicis adducts the thumb. It is the only thenar muscle not supplied by the median nerve, and is supplied by the deep branch of the ulnar nerve.Question 8What is the sensory distribution of the ulnar nerve in the hand? A) Ulnar 1.5 fingers on the palmar surface of the handB) Ulnar 1.5 fingers on the dorsal surface of the handC) Radial 1.5 fingers on the palmar surface of the handD) Radial 1.5 fingers on the radial surface of the handE) Ulnar 1.5 fingers on the palmar and dorsal surface of the hand The ulnar nerve supplies sensation to both the dorsal and volar aspect of the ulnar 1.5 digits. It does this via its dorsal and palmar sensory branches. Question 9Which nerve passes through the carpal tunnel? A) Ulnar nerveB) Median nerveC) Radial nerveD) Axillary nerveE) Musculocutaneous nerve The carpal tunnel is a fascial tunnel of the wrist and proximal palm. It encases 8 tendons of the FDP and FDS, and the median nerve. The flexor pollicis longus runs in its own tunnel, and the ulnar nerve and artery runs in Guyon s canal. Question 10Which specific artery supplies the thumb? A) Princeps pollicis, branch of the superficial palmar archB) Princeps pollicis, branch of the deep palmar archC) 1st digital artery, branch of the superficial palmar archD) 2nd digital artery, branch of the deep palmar archE) Ulnar artery The princeps pollicis artery arises from the deep palmar arch, and supplies the thumb. The other 4 digits are supplied mainly by the superficial palmar arch.
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