Arm & Forearm muscles

Question 1

Anterior Compartment of the arm (flexors)

Answer 1

biceps brachii, brachialis, coracobrachialis; musculocutaneous nerve (C5-7)

Question 2

Biceps Brachii

Answer 2

musculocutaneous nerve (C5-7); supination of forearm, flexion of elbow jt, flexion of shoulder jt

Question 3

Coracobrachialis

Answer 3

musculocutaneous nerve (C5-7); adduction of the arm, flexion of the arm (DOES NOT ACT ON THE FOREARM NO NO NO NO NO)

Question 4

Brachialis

Answer 4

musculocutaneous nerve (C5-7); flexion of forearm (the only pure flexor)

Question 5

Posterior Compartment of the arm (extensors)

Answer 5

triceps brachii, anconeus; radial nerve (C5-T1)

Question 6

Triceps Brachii

Answer 6

Extension of forearm (main-medial head,
long and lateral heads-active in extension against resistance)
Extension of shoulder;
Radial nerve

Question 7

Anconeus

Answer 7

Extension of the elbow; radial nerve (attaches to lateral epicondyle and olecranon process)

Question 8

Anterior Compartment of the forearm (flexor-pronator)- Superficial & Intermediate muscles

Answer 8

pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, flexor digitorum superficialis

Question 9

Pronator Teres

Answer 9

pronation of forearm, (weak) flexion of forearm at elbow; median nerve (C5-T1)

Question 10

Flexor Carpi Radialis

Answer 10

flexion of hand at wrist, abduction of the wrist; median nerve (C5-T1)

Question 11

Palmaris Longus

Answer 11

flexion of the wrist; median nerve (C5-T1)

Question 12

Flexor Carpi Ulnaris

Answer 12

adduction of the wrist, flexion of the wrist; ulnar nerve (C8, T1)

Question 13

Flexor Digitorum Superficialis

Answer 13

flexes proximal interphalangeal, metacarpophalangeal, & wrist joints; median nerve (C5-T1)
Short answer: flexes wrist and fingers, median n.

Question 14

Anterior Compartment of the forearm (flexor-pronator)- Profound layer

Answer 14

pronator quadratus, flexor digitorum profundus, flexor pollicis longus

Question 15

Pronator Quadratus

Answer 15

pronation of the forearm; anterior interosseous (branch of median nerve)

Question 16

Flexor Digitorum Profundus

Answer 16

flexes all the IP joints (distal and prox), the MP, & the wrist joints; anterior interosseous (branch of median nerve) innervates lateral half, ulnar nerve innervates medial half
Short answer: flexion of phalanges and wrist, AI & ulnar nn

Question 17

Flexor Pollicis Longus

Answer 17

flexes the IP & MP joints of thumb; anterior interosseous (branch of median n)
Short answer: flexion of 2nd phalanx of thumb; AI nerve

Question 18

Posterior Compartment- Superficial muscles

Answer 18

brachioradialis (the one flexor of this compartment), extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum, extensor digiti minimi

Question 19

Brachioradialis

Answer 19

flexion of elbow joint; radial nerve (C5-T1)

Question 20

Extensor Carpi Radialis Longus

Answer 20

extension of wrist, abductor of wrist; radial nerve (C5-T1)

Question 21

Extensor Carpi Radialis Brevis

Answer 21

extension of wrist, abductor of wrist; radial nerve (C5-T1)

Question 22

Extensor Carpi Ulnaris

Answer 22

extension of wrist, adduction of wrist; posterior interosseous (radial nerve)

Question 23

Extensor Digitorum

Answer 23

extension of fingers (primarily MP joint); posterior interosseous (radial nerve)

Question 24

Extensor Digiti Minimi

Answer 24

extension of 5th digit; posterior interosseous (radial nerve)

Question 25

Posterior Compartment- Profound muscles

Answer 25

supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis

Question 26

Supinator

Answer 26

supination of forearm; deep branch of radial nerve

Question 27

Abductor Pollicis Longus

Answer 27

abduction of thumb, extension of thumb; posterior interosseous nerve (radial nerve)

Question 28

Extensor Pollicis Brevis

Answer 28

extension of thumb (proximal phalanx); posterior interosseous nerve (radial nerve)

Question 29

Extensor Pollicis Longus

Answer 29

extension of distal phalanx of thumb; posterior interosseous nerve (radial nerve)

Question 30

Extensor Indicis

Answer 30

extension of the 2nd digit (index finger), assists in extension of wrist; posterior interosseous nerve (radial nerve)