Distal Upper Extremity

Question 1

the brachioradialis originates where?

Answer 1

lateral epicondyle

Question 2

which of these does not originate at the medial epicondyle in the arm?
pronator teres
brachioradialis
flexor carpi radialis
palmaris longus
flexor carpi ulnaris
flexor digitorum superficialis

Answer 2

the brachioradialis originates at the lateral epicondyle

Question 3

the thumb is found on the radial or ulnar side of the forearm?

Answer 3

radial

Question 4

at the base of the thumb is the anatomical snuff box. What are its boundaries and what is its floor?

Answer 4

boundaries of anatomical snuff box are extensor pollicis longus (medial) and extensor pollicis brevis (lateral). The scaphoid bone makes up the floor

Question 5

what structure forms the roof of the carpal tunnel

Answer 5

flexor retinaculum

Question 6

what might be done to relieve pressure on the media nerve in carpal tunnel syndrome?

Answer 6

divide the flexor retinaculum, which makes the roof of the carpal tunnel

Question 7

the ____ branch of the median nerve supplies the muscles of the thenar eminence

Answer 7

recurrent branch of median nerve

Question 8

the adductor pollicis of the thumb is in fact not part of the thenar eminence, and is supplied by the ___ nerve, not the recurrent branch of the median nerve

Answer 8

ulnar nerve supplies adductor pollicis of thumb

Question 9

what is the functional similarity and difference between the dorsal interossei (of which there are 4) and the palmar interossei (of which there are 3) muscles of the hand?

Answer 9

dorsal interosseus muscles - arise from metacarpals to spread digits, flex metacarpointerphalangeal (MP) joints, extend interphalangeal (IP) joints

palmar interosseus muscles - arise from metacarpals to bring digits together, flex MP joints and extend IP joints

Question 10

what bones form the radiocarpal or wrist joint?

Answer 10

scaphoid, lunate, articular surface of radius

Question 11

T/F: the ulna does not articular directly with the carpal bones

Answer 11

TRUE: ulna articulates through the triangular fibrocartilage (like a meniscus)