Unit 2 - Upper Limb: Posterior Compartment of Forearm, Superficial Muscles (Ex. II)

Question 1

extensor digiti minimi

Answer 1

O: common head (L epicondyle of humerus)
I: dorsal digital expansion of digit 5
Inn: radial N (C7, C8)
A: wrist - extension, ulnar deviation of hand; extension and abduction of digit 5 @ MCP, PIP, and DIP joints of digit 5

Question 2

extensor carpi ulnaris

Answer 2

O: common head (L epicondyle of humerus); ulnar head - dorsal surface of ulna
I: base of 5th metacarpal
Inn: radial N (C7, C8)
A: wrist - extension, adduction (ulnar deviation) of hand

Question 3

extensor digitorum

Answer 3

O: common head (L epicondyle of humerus)
I: dorsal digital expansion of digits 2-5
Inn: radial N (C7, C8)
A: wrist extension; extension/abduction of fingers @ MCP, PIP, and DIP joints of digits 2-5