Exam 2 Muscle Actions

Question 1

Neck lateral flexion

Answer 1

Anterior, middle, posterior scalene

Question 2

Rib elevation

Answer 2

anterior and middle scalene (1st) and posterior scalene (2nd)

Question 3

Shoulder flexion

Answer 3

coracobrachialis

Question 4

shoulder adduction

Answer 4

coracobrachialis

Question 5

Resists shoulder dislocation

Answer 5

biceps brachii (short head), coracobrachialis, triceps brachii (long head)

Question 6

Elbow flexion

Answer 6

biceps brachii, brachialis, brachioradialis, *pronator teres

Question 7

elbow extension

Answer 7

triceps brachii, *anconeus

Question 8

forearm supination

Answer 8

biceps brachii, supinator, *brachioradialis

Question 9

forearm pronation

Answer 9

pronator teres, pronator quadratus, *brachioradialis, *anconeus

Question 10

wrist flexion

Answer 10

flexor carpi radialis, flexor carpi ulnaris, *flexor digitorum profundus

Question 11

wrist extension

Answer 11

extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris, *extensor indicis

Question 12

radial deviation (Abduct)

Answer 12

flexor carpi radialis, extensor carpi radialis longus, extensor carpi radialis brevis

Question 13

ulnar deviation (Adduct)

Answer 13

flexor carpi ulnaris, extensor carpi ulnaris

Question 14

fist clenching

Answer 14

extensor carpi radialis longus, extensor carpi ulnaris

Question 15

Long Digit (4) MCP and IP Joint Flexion

Answer 15

flexor digitorum superficialis (not at DIP), flexor digitorum profundus, flexor digiti minimi (5th digit, MCP)

Question 16

Long Digit (4) MCP and IP Joint Extension

Answer 16

extensor digitirum, extensor digiti minimi (5th digit), extensor indices (2nd digit)

Question 17

Long Digit (4) MCP and IP Joint Abduction

Answer 17

abductor digiti minimi (5th digit, MCP), dorsal interossei (digits 2-4)

Question 18

Long Digit (4) MCP and IP Joint Adduction

Answer 18

palmar interossei (digits 2,4,5)

Question 19

Opposition (5th digit)

Answer 19

opponens digiti minimi (CMC)

Question 20

Lumbrical Grip (MCP flex, IPs extend)

Answer 20

lumbricals, *palmar interossei, *dorsal interossei

Question 21

Thumb - CMC, MCP, & IP joint Flexion

Answer 21

flexor pollicis longus, flexor pollicis brevis (not at IP)

Question 22

Thumb - CMC, MCP, & IP joint Extension

Answer 22

extensor pollicis longus, extensor pollicis brevis (not at IP), abductor pollicis longus

Question 23

Thumb Abduction (CMC)

Answer 23

abductor pollicis longus, abductor pollicis brevis

Question 24

Thumb Adduction (CMC, MCP)

Answer 24

adductor pollicis

Question 25

Thumb opposition

Answer 25

opponens pollicis, *flexor pollicis brevis, *abductor pollicis brevis