Upper Extremity Anatomy

Question 1

What muscles in the hand are innervated by the median nerve?

Answer 1

1/2 LOAF

Medial 2 lumbricals, opponens pollicis, APB, Flexor pollicis Brevis

Question 2

What are the contents of the carpal tunnel?

Answer 2

4 Flexor digitorum superficialis tendons, 4 flexor digitorum profundus tendons, FPL tendon, median n.

Question 3

What forearm muscles are innervated by the median nerve?

Answer 3

Anterior forearm: Pronater teres, flexor carpi radialis, palmaris longus
Flexor digitorum superficialis
Medial half of flexor digitorum profundus (via AIN)
Flexor pollicis longus (via AIN)

Question 4

What forearm muscles are innervated by the ulnar n.?

Answer 4

Flexor carpi ulnaris

Half of flexor digitorum profundus

Question 5

What innervates all the muscles in the posterior forearm and what are they?

Answer 5

Radial n. via deep branch or PIN
Brachioradilis, extensor carpi radialis longus and brevis (deep branch), extensor digitorum (PIN), Extensor digiti minimi (PIN), extensor carpi ulnaris (PIN)
Supinator (deep branch), extensor indicis (deep), abductor pollicis longus (PIN), extensor pollicis brevis (PIN), extensor pollicis longus (PIN)

Question 6

What muscles in the hand are innervated by the ulnar n.?

Answer 6

LOAF + 3
3rd and 4th Lumbricals
Opponens digiti minimi
Abductor DM
Flexor DM

3 other hand muscles: Flexor pollicis brevis, adductor pollicis, interossei (DAB’s and PAD’s)

Question 7

What nerve root, trunk, and cord gives off the Axillary n?

What muscles does it innervate?

Answer 7

C5-6
Upper trunk
Posterior cord
Deltoid and Teres minor

Question 8

What roots, trunk, and cord form the musculocutaneous n?

Answer 8

C5-6
Upper trunk
Lateral cord

Question 9

What nerve, roots, trunks, and cord supply the triceps?

Answer 9

C7 (C6-8)
Upper, middle, lower trunks
Posterior cord

Question 10

What roots, trunks, cord, and nerve supplies pronator Teres?

Answer 10

Median n.
C6-7
Upper and middle trunks
Lateral cord

Question 11

Where does AIN arise from and what does it innervate?

Answer 11

Motor branch of median n. Branches off between 2 heads of pronator teres
Innervates FPL, pronator quadratics, and FDP of index/middle finger

Question 12

APB: what are the nerve roots, trunk, cord, and nerve innervation?

Answer 12

C8-T1
Lower trunk
Medial cord
Median nerve