Arm/Forearm/Hand Innervation

Question 1

Superficial layer of anterior forearm muscles:

1.Pronator Teres
2. Flexor Carpi Radialis
3. Palmaris Longus
4. Flexor Carpi Ulnaris

Answer 1

Median nerve C5-T1 EXCEPT FLEXOR CARPI ULNARIS

Question 2

intermediate layer of anterior forearm muscles: (1)

1. Flexor Digitorum Superficialis

Answer 2

Innervated by median nerve

Question 3

deep layer of anterior forearm muscles:

1. Flexor Digitorum Profundus (lies under superficialis)
2. Flexor pollicis longus
3. Pronator quadratus

Answer 3

Flexor digitorum profundus digits (1-2), flexor pollicis longus, and pronator quadratus anterior interossesous median n.

Flexor digitorum profundus digits (4-5) ulnar n.

Question 4

What nerve & accompanying artery passes deep to the pronator quadrates?

Answer 4

anterior interossesous artery and nerve

Question 5

the superficial extensor muscles that originate supracondylar are innervated by

1. brachioradialis
2. extensor carpi radialis longus

Answer 5

radial n.

Question 6

the superficial extensor muscles that originate at the lateral epicondyle are innervated by:

1. extensor carpi radialis brevis
   2.extensor digitorum
2. extensor digiti minimi
3. extensor carpi ulnaris

Answer 6

deep branch of the radial n.

Question 7

Deep layer of the posterior forearm (extensors) are innervated by:

1. extensor indicis
2. extensor pollicis longus
3. extensor pollicis brevis
4. abductor pollicis longus

Answer 7

posterior interosseous n (continuation of the deep radial n.)

Question 8

What borders the anatomical snuff box

Answer 8

1. extensor pollicis brevis
2. extensor pollicis longus
3. abductor pollicis longus

Question 8

Thenar muscles are innervated by:

Answer 8

recurrent branch of median n.

Question 9

hypothenar muscles are innervated by:

Answer 9

deep branch of ulnar n.

Question 10

in the forearm + hand the ulnar nerve innervates:

1. Adductor _____
2. Lumbricals _ & _
3. 3 palmar _____
4. 4 dorsal ______
5. Hypothenar muscles (known as the “___”

Answer 10

in the forearm + hand the ulnar nerve innervates:

1. Adductor pollicis
2. Lumbricals 3&4
3. 3 palmar interossei
4. 4 dorsal interossei
5. Hypothenar muscles (known as the “minimis”