The Arm and Forearm

Question 1

The radial (“spiral”) groove houses which two structures?

Answer 1

Radial n.
Profunda brachii a.
(same as in the Triangular Interval)

Question 2

Name three muscles of the anterior compartment of the arm.

Answer 2

Biceps brachii
Coracobrachialis
Brachialis

Question 3

Which nerve primarily innervates the muscles of the anterior compartment of the arm?

Answer 3

Musculocutaneous n.

Brachialis also receives innervation from the Radial n.

Question 4

Name two muscles of the posterior compartment of the arm.

Answer 4

Triceps brachii

Anconeus

Question 5

Which nerve innervates the muscles of the posterior compartment of the arm?

Answer 5

Radial n.

Question 6

Which nerves primarily innervate the anterior compartment of the forearm?

Answer 6

Median n. (Pronator teres, Flexor carpi radialis, Palmaris longus)
Ulnar n. (Flexor carpi ulnaris)

Question 7

Name four superficial muscles of the anterior compartment of the forearm.

Answer 7

Pronator teres
Flexor carpi radialis
Flexor carpi ulnaris
Palmaris longus

Question 8

Name one intermediate muscle of the anterior compartment of the forearm.

Answer 8

Flexor digitorum superficialis

Question 9

Name three deep muscles of the anterior compartment of the forearm.

Answer 9

Flexor digitorum profundus
Flexor pollicis longus
Pronator quadratus

Question 10

Name six superficial muscles of the posterior compartment of the forearm.

Answer 10

Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor carpi ulnaris
Extensor digitorum
Extensor digiti minimi

Question 11

Name one deep muscle of the posterior compartment of the forearm.

Answer 11

Supinator

Question 12

Name three outcropping muscles of the posterior compartment of the forearm.

Answer 12

Abductor pollicis longus
Extensor pollicis longus
Extensor pollicis brevis

Question 13

Flexor digitorum profundus receives innervation from

Answer 13

Digits II-III: Anterior interosseous n. from median n.

Digits IV-V: Ulnar n.

Question 14

The anterior interosseous n. innervates

Answer 14

flexor digitorum profundus (digits II and III),
flexor pollicis longus, and
pronator quadratus.

Question 15

The posterior interosseous n. innervates

Answer 15

extensor digitorum, extensor digiti minimi, extensor carpi ulnaris
and
abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis, extensor indicis.

Question 16

The anterior interosseous n. is a branch of the ___________ n.

Answer 16

median

Question 17

The posterior interosseous n. is a branch of the ___________ n.

Answer 17

radial

Question 18

The deep branch of the radial n. innervates

Answer 18

supinator and extensor carpi radialis brevis.