Muscle Actions

Question 1

Subscapularis

Answer 1

Medial rotation of the humerus
Adduction of shoulder
Reinforce glenohumeral joint

Question 2

Teres Minor

Answer 2

Lateral shoulder rotation

Reinforce glenohumeral joint

Question 3

Infraspinatus

Answer 3

Lateral shoulder rotation

Reinforce glenohumeral joint

Question 4

Supraspinatus

Answer 4

Abduct shoulder

Reinforce glenohumeral joint

Question 5

Teres Major

Answer 5

Adduction of the shoulder

Medial rotation of the humerus

Question 6

Deltoid

Answer 6

Shoulder abductor
Shoulder flexor
Shoulder extender

Question 7

Semispinalis

Answer 7

Extends the head, C, and T

Rotates T and C regions

Question 8

Splenius

Answer 8

Flex the neck, rotate the head

Question 9

Longissimus

Answer 9

Extend vertebral column and head, eccentric back flexion.

Flexes vertebral column if unilateral

Question 10

Spinalis

Answer 10

Extend vertebral column and head, eccentric back flexion.

Flexes vertebral column if unilateral

Question 11

Iliocostalis

Answer 11

Extend vertebral column and head, eccentric back flexion.

Flexes vertebral column if unilateral

Question 12

Levator Scapulae

Answer 12

Elevates scapula

Question 13

Rhomboid Major

Answer 13

Retract scapula, weak elevation

Question 14

Rhomboid Minor

Answer 14

Retract scapula, weak elevation

Question 15

Latissimus Dorsi

Answer 15

Extend shoulder, adduct should, medial rotation of the humerus

Question 16

Trapezius

Answer 16

Elevate, depress, and retract the scapula

Question 17

Biceps brachii

Answer 17

Elbow flexion, Arm flexion, supination

Question 18

Coracobrachialis

Answer 18

Flex shoulder

Question 19

Brachialis

Answer 19

Flex elbow

Question 20

Triceps brachii

Answer 20

Extend shoulder, extend elbow

Question 21

Pronator teres

Answer 21

pronate arm, weak elbow flexion

Question 22

Flexor carpi radialis

Answer 22

flex, abduct wrist

Question 23

palmaris longus

Answer 23

flex hand, weak elbow flexion

Question 24

flexor carpi ulnaris

Answer 24

flex wrist, adduct hand

Question 25

brachioradialis

Answer 25

weak elbow flexor

Question 26

flexor digitorum superficialis

Answer 26

flex PIP joint and metacarpophalangeal joint, poor elbow flexion

Question 27

Flexor pollicis longus

Answer 27

flex thumb

Question 28

pronator quadratus

Answer 28

pronation

Question 29

flexor digitorum profundus

Answer 29

flex distal IP joint, assist with wrist flexion

Question 30

extensor carpi radialis longus

Answer 30

extend, abduct wrist

Question 31

extensor carpi radialis brevis

Answer 31

extend, abduct wrist

Question 32

extensor digitorum

Answer 32

extend wrist, extend metacarpophalangeal joints and interphalangeal joints

Question 33

extensor carpi ulnaris

Answer 33

extend and adduct wrist

Question 34

supinator

Answer 34

supination, rotate radius to turn palm

Question 35

abductor pollicis longus

Answer 35

extend wrist, abduct thumb, extend carpometacarpal joint

Question 36

extensor pollicis brevis

Answer 36

extend wrist, extend prox pollic phalanx, extend carpometacarpal joint

Question 37

extensor pollicis longus

Answer 37

extend wrist, extend distal pollic phalanx, extend carpometacarpal joint

Question 38

extensor indicis

Answer 38

extend wrist, extend index finger

Question 39

Opponens pollicis

Answer 39

draws metacarpal 1 in medially and rotates it

Question 40

abductor pollicis brevis

Answer 40

abducts thumb, aids in opposition

Question 41

flexor pollicis brevis

Answer 41

flexes thumb

Question 42

adductor pollicis

Answer 42

adducts thumb

Question 43

abductor digiti minimi

Answer 43

abducts 5th digit

Question 44

flexor digiti minimi

Answer 44

flexes proximal phalanx of 5th finger

Question 45

opponens digiti minimi

Answer 45

draws 5th metacarpal anteriorally and rotates it for opposition

Question 46

lumbricals

Answer 46

flex metacarpophalangeal joints, extend interphalangeal joints of digits 2-5

Question 47

dorsal interossei

Answer 47

abduct digits 2-4, flex metacarpophalangeal joints, extend interphalangeal joints

Question 48

palmer interossei

Answer 48

adduct digits 2, 4, 5, flex metacarpophalangeal joints, extend interphalangeal joints

Question 49

palmaris brevis

Answer 49

wrinkles palmar skin during grip