Posterior Forearm/Dorsal Hand

Question 1

Does the superficial group in the posterior compartment of the arm cross the elbow?

Answer 1

yes

Question 2

Does the deep group of muscles in the posterior compartment off the forearm cross the elbow?

Answer 2

no

Question 3

What nerve innervates the posterior compartment of the forearm?

Answer 3

Radial nerve (C5-C8)

Question 4

Where do synovial cysts (“ganglionic”) most commonly form in the wrist?

Answer 4

Extensor carpi radialis brevis sheath

Question 5

What is lateral epicondulitis?

Answer 5

“Tennis elbow”

-inflammation of common extensor origin and periosteum of the lateral epicondyle

Question 6

What nerve is being tested with the Brachioradialis reflex test?

Answer 6

Radial nerve, C6

Question 7

What does the Radial nerve branch into in the postior compartment of the forearm?

Answer 7

1. Deep branch - (motor): to muscles of the posterior compartmment of the forearm
2. Supericial branch (sensory) skin of lateral wrist, snuff box, and lateral dorsal hand

Question 8

Is most blood to the digits from the dorsal or palmar side of the hand?

Answer 8

palmar arches supply most of the blood

Question 9

Severance of the Radial Nerve in the Axilla will cause what?

Answer 9

“wrist drop” due to loss of extension of the wrist and extension of MCP joints

-Extension of elbow also lost