UE Muscles - Actions

Question 1

Latissimus dorsi

Answer 1

actions- humeral adduction, extension & medial rotation

Question 2

Levator scapulae (C4-5)

Answer 2

actions- elevation & inferior rotation of the lateral angle of the scapula

Question 3

Pectoralis major

Answer 3

actions- humeral adduction, flexion & medial rotation

Question 4

Pectoralis minor

Answer 4

actions- scapular protraction & assists with depression of the shoulder (assists with forcedinspiration [with scapular fixation])

Question 5

Rhomboids (C4-5)

Answer 5

actions- scapular retraction & inferior rotation of the lateral angle

Question 6

Serratus anterior (C5-7)

Answer 6

actions- scapular protraction & upward rotation of the lateral angle of the scapula

Question 7

Subclavius

Answer 7

actions- depresses point of shoulder

Question 8

Trapezius

Answer 8

actions- scapular elevation, depression, retraction & superior rotation of the lateral angle

Question 9

Deltoid (C5-6)

Answer 9

actions- humeral flexion, medial rotation, abduction, extension & lateral rotation

Question 10

Subscapularis

Answer 10

actions- stabilizes the glenohumeral joint, and medially rotates & adducts humerus

Question 11

Supraspinatus

Answer 11

actions- initiates humeral abduction

Question 12

Teres major

Answer 12

actions- humeral adduction & medial rotation

Question 13

Infraspinatus (C5-6)

Answer 13

actions- stabilizes glenohumeral joint, and lateral rotation of humerus

Question 14

Teres minor (C5-6)

Answer 14

actions- stabilizes glenohumeral joint, and lateral rotation of humerus

Question 15

Biceps Brachii (C5, 6)

Answer 15

actions- flexion of the arm & forearm, & supination of the forearm

Question 16

Brachialis

Answer 16

actions- flexion of the forearm

Question 17

Coracobrachialis

Answer 17

actions- flexion & adduction of arm

Question 18

Triceps (C7,8)

Answer 18

actions- extension of the arm (long head) & extension of the forearm (long, lateral & Triceps (C7,8)medial heads)

Question 19

Abductor pollicis longus

Answer 19

actions- abducts and extends thumb at carpometacarpal joint

Question 20

Anconeus

Answer 20

actions- extension of forearm

Question 21

Brachioradialis

Answer 21

actions- flexes forearm

Question 22

Extensor carpi radialis brevis

Answer 22

actions- extends & abducts hand at wrist

Question 23

Extensor carpi radialis longus

Answer 23

actions- extends & abducts hand at wrist

Question 24

Extensor carpi ulnaris

Answer 24

actions- extends & adducts hand at wrist

Question 25

Extensor digitorum

Answer 25

actions- extends phalanges (MP) and hand at wrist

Question 26

Extensor digiti minimi

Answer 26

actions- extends 5th digit (MP & IP)

Question 27

Extensor indicis

Answer 27

actions- extends 2nd digit (MP & IP)

Question 28

Extensor pollicis brevis

Answer 28

actions- extends thumb (MP)

Question 29

Extensor pollicis longus

Answer 29

actions- extends thumb (MP & IP)

Question 30

Flexor carpi radialis

Answer 30

actions- flexes & abducts hand at wrist

Question 31

Flexor carpi ulnaris

Answer 31

actions- flexes & adducts hand at wrist

Question 32

Flexor digitorum profundus

Answer 32

actions- flexion of digits 2-5 (MP & IP), and flexion hand at wrist

Question 33

Flexor digitorum superficialis

Answer 33

actions- flexion of digits (MP & proximal IP), and hand at wrist

Question 34

Flexor pollicis longus

Answer 34

actions- flexes thumb (MP & IP)

Question 35

Palmaris longus

Answer 35

actions- flexes hand at wrist

Question 36

Pronator quadratus

Answer 36

actions- pronates the forearm

Question 37

Pronator teres

Answer 37

actions- pronates & flexes forearm

Question 38

Supinator

Answer 38

actions- supinates forearm

Question 39

Abductor digit minimi (C8-T1)

Answer 39

actions- abducts 5th digit

Question 40

Abductor pollicis brevis (C8-T1)

Answer 40

actions- abducts thumb

Question 41

Adductor pollicis (C8-T1)

Answer 41

actions- adducts thumb

Question 42

Dorsal interossei (C8-T1)

Answer 42

actions- abducts (MP), flexes (MP) & extends (IP) digits 2-4

Question 43

Flexor digiti minimi brevis (C8-T1)

Answer 43

actions- flexes (MP) 5th digit

Question 44

Flexor pollicis brevis (C8-T1)

Answer 44

actions- flexes (MP) thumb

Question 45

Lumbricals (C8-T1)

Answer 45

actions- flexes (MP) and extends (IP) digits 2-5

Question 46

Opponens digiti minimi (C8-T1)

Answer 46

actions- opposition of 5th digit to thumb

Question 47

Opponens pollicis (C8-T1)

Answer 47

actions- opposition of thumb to 5th digit

Question 48

Palmar interossei (C8-T1)

Answer 48

actions- adducts (MP), flexes (MP) & extends (IP) digits 2, 4 & 5