Muscle Actions

Question 1

Latissimus Dorsi

Answer 1

Humeral adduction, extension, and medial rotation

Question 2

Levator Scapulae

Answer 2

Elevation and inferior rotation of the lateral angle of the scapula

Question 3

Pectoralis Major

Answer 3

Humeral adduction, flexion, and medial rotation

Question 4

Pectoralis Minor

Answer 4

Scapular protraction and assists with depression of the shoulder (assists with forced inspiration [with scapular fixation])

Question 5

Rhomboids

Answer 5

Scapular retraction and inferior rotation of the lateral angle

Question 6

Serratus anterior

Answer 6

Scapular protraction and upward rotation of the lateral angle of the scapula

Question 7

Trapezius

Answer 7

Scapular elevation, depression, retraction, and superior rotation of the lateral angle

Question 8

Deltoid

Answer 8

Humeral flexion, medial rotation, abduction, extension, and lateral rotation

Question 9

Subscapularis

Answer 9

Stabilizes the glenohumeral , medially rotates and adducts humerus

Question 10

Supraspinatus

Answer 10

Initiates humeral abduction

Question 11

Teres Major

Answer 11

Humeral adduction and medial rotation

Question 12

Infraspinatus

Answer 12

Stabilizes glenohumeral joint, and lateral rotation of humerus

Question 13

Teres minor

Answer 13

Stabilizes glenohumeral joint, and lateral rotation of humerus

Question 14

Biceps brachii

Answer 14

Flexion of the arm and forearm, and supination of the forearm

Question 15

Brachialis

Answer 15

Flexion of the forearm

Question 16

Coracobrachialis

Answer 16

Flexion and adduction of arm

Question 17

Triceps

Answer 17

Extension of the arm (long head) and extension of the forearm (long, lateral, and medial heads)

Question 18

Abductor pollicis longus

Answer 18

Abducts and extends thumb at carpometacarpal joint

Question 19

Brachioradialis

Answer 19

Flexes forearm

Question 20

Extensor carpi radialis brevis

Answer 20

Extends and abducts hand at wrist

Question 21

Extensor carpi radialis longus

Answer 21

Extends and abducts hand at wrist

Question 22

Extensor carpi ulnaris

Answer 22

Extends and adducts hand at wrist

Question 23

Extensor digitorum

Answer 23

Extends phalanges (MP) and hand at wrist

Question 24

Extensor digiti minimi

Answer 24

Extends 5th digit (MP & IP)

Question 25

Extensor indicis

Answer 25

Extends 2nd digit (MP & IP)

Question 26

Extensor pollicis brevis

Answer 26

Extends thumb (MP)

Question 27

Extensor pollicis longus

Answer 27

Extends thumb (MP & IP)

Question 28

Flexor carpi radialis

Answer 28

Flexes and abducts hand at wrist

Question 29

Flexor carpi ulnaris

Answer 29

Flexes and adducts hand at wrist

Question 30

Flexor digitorum profundus

Answer 30

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

Question 31

Flexor digitorum superficialis

Answer 31

Flexion of digits (MP & proximal IP), and hand at wrist

Question 32

Flexor pollicis longus

Answer 32

Flexes thumb (MP & IP)

Question 33

Palmaris longus

Answer 33

Flexes hand at wrist

Question 34

Pronator quadratus

Answer 34

Pronates the forearm

Question 35

Pronator teres

Answer 35

Pronates and flexes forearm

Question 36

Supinator

Answer 36

Supinates forearm

Question 37

Abductor digiti minimi

Answer 37

Abducts 5th digit

Question 38

Abductor pollicis brevis

Answer 38

Abducts thumb

Question 39

Adductor pollicis

Answer 39

Adducts thumb

Question 40

Dorsal interossei

Answer 40

Abducts, flexes, and extends digits 2-4

Question 41

Flexor digiti minimi brevis

Answer 41

Flexes 5th digit

Question 42

Flexor pollicis brevis

Answer 42

Flexes thumb

Question 43

Lumbricals

Answer 43

Flexes and extends digits 2-5

Question 44

Opponens digiti minimi

Answer 44

Opposition of 5th digit to thumb

Question 45

Opponens pollicis

Answer 45

Opposition of thumb to 5th digit

Question 46

Palmar interossei

Answer 46

Adducts, flexes, and extends digits 2, 4, and 5