5 Nerves of the Arm

Question 1

Musculocutaneous origin

Answer 1

C5-7

Question 2

Musculocutaneous innervation

Answer 2

anterior arm innervating the following muscles: coracobrachialis, biceps brachii, and brachialis

Question 3

Median origin

Answer 3

C6-8, T1 (sometimes C5)

Question 4

Median innervation

Answer 4

muscles of the anterior forearm except flexor carpal ulnaris and half of flexor digitorum profundus, in the hand: 3 thenar muscles and 2 radial lumbricals

Question 5

Ulnar origin

Answer 5

C7, C8, T1

Question 6

Ulnar innervation

Answer 6

muscles of the ulnar side of the anterior forearm (the ones the median does not): flexor carpi ulnaris and half of the flexor digitorum profundus, the entire hand except muscles innervated by the median nerve

Question 7

Ulnar and Median nerve distribution in the anterior hand

Answer 7

the ulnar nerve has the medial 1/2 of the ring finger and the pinkey while the median nerve has the lateral 1/2 of the ring finger over to the finger

Question 8

Radial origin

Answer 8

C5-8, T1

Question 9

Radial innervation

Answer 9

entire posterior arm (all three heads of the triceps brachii) and posterior forearm (extensor muscles), cutaneous over most posterior of hand

Question 10

Axillary origin

Answer 10

C5-6

Question 11

Axillary innervation

Answer 11

teres minor, deltoid, cutaneous over deltoid