Muscles & actions

Question 0

orbicularis oculi

Answer 0

closes eyes

Question 1

orbicularis oris

Answer 1

• closes mouth

- protrudes lips

Question 2

masseter

Answer 2

• closes jaw

- elevates mandible

Question 3

temporalis

Answer 3

• closes jaw

- elevates mandible

Question 4

pectoralis major

Answer 4

flexes, adducts, & medially rotates the arm at the shoulder

Question 5

brachioradialis

Answer 5

flexes the forearm at the elbow

Question 6

pronator teres

Answer 6

pronates the forearm at the proximal-radio ulnar joint

Question 7

flexor carpi radialis

Answer 7

• flexes the hand at the wrist

- abducts (radial deviation) the hand at the wrist

Question 8

flexor carpi ulnaris

Answer 8

• flexes the hand at the wrist

- adducts (ulnar deviation) the hand at the wrist

Question 9

flexor digitorum superficialis

Answer 9

flexes the wrist & middle phalanges of 2nd-5th digits

Question 10

extensor digitorum

Answer 10

extends the digits & the hand at the wrist

Question 11

supinator

Answer 11

supinates the forearm at the proximal-radio ulnar joint

Question 12

psoas major

Answer 12

• flexes the thigh at the hip

- flexes the trunk if lower extremity remains on floor

Question 13

iliacus

Answer 13

flexes the thigh at the hip

Question 14

gluteus maximus

Answer 14

extends & laterally rotates the thigh at the hip

Question 15

gluteus medius

Answer 15

abducts the thigh

Question 16

vastus lateralis

Answer 16

extends the leg at the knee

Question 17

vastus medialis

Answer 17

extends the leg at the knee

Question 18

vastus intermedius

Answer 18

extends the leg at the knee

Question 19

rectus femoris

Answer 19

extends the leg at the knee & flexes the thigh at the hip

Question 20

sartorius

Answer 20

• flexes & laterally rotates the thigh at the hip

- flexes the leg at the knee

Question 21

biceps femoris

Answer 21

• flexes the leg at the knee

- extends & laterally rotates the thigh at the hip (long head)

Question 22

semitendinosus

Answer 22

• flexes the leg at the knee

- extends & medially rotates the thigh at the hip

Question 23

semimembranosus

Answer 23

• flexes the leg at the knee

- extends & medially rotates the thigh at the hip

Question 24

gracilis

Answer 24

adducts the thigh at the hip

Question 25

tibialis anterior

Answer 25

dorsiflexion & inversion of ankle and foot

Question 26

extensor digitorum longus

Answer 26

- extension of digits | - dorsiflexion at ankle

Question 27

gastrocnemius

Answer 27

- plantar flexes the foot when knee is extended | - flexes the leg at the knee

Question 28

soleus

Answer 28

plantar flexion of the foot at the ankle

Question 29

sternocleidomastoid

Answer 29

- flexion of the neck forward when both muscles contract together - lateral flexion to the same side, coupled w/ rotation towards the opposite side if unilateral contraction

Question 30

deltoid

Answer 30

- abduction of the arm at the shoulder | - also can flex or extend at the shoulder

Question 31

levator scapulae

Answer 31

elevates the scapula

Question 32

trapezius

Answer 32

- retracts the scapula - elevates or depresses the scapula - can also extend the head

Question 33

latissimus dorsi

Answer 33

extends, adducts, & medially rotates the shoulder

Question 34

supraspinatus

Answer 34

abduction at the shoulder

Question 35

infraspinatus

Answer 35

lateral rotation at the shoulder

Question 36

subscapularis

Answer 36

medial rotation at the shoulder

Question 37

teres minor

Answer 37

lateral rotation at the shoulder

Question 38

teres major

Answer 38

medial rotation & adduction at shoulder

Question 39

diaphragm

Answer 39

flattens to increase the volume of the thoracic cavity, resulting in inspiration

Question 40

rhomboids (major & minor)

Answer 40

retracts scapula

Question 41

rectus abdominis

Answer 41

flexes vertebral column

Question 42

internal oblique abdominis

Answer 42

- flexes & rotates vertebral column | - compresses the abdomen

Question 43

external oblique abdominis

Answer 43

- flexes & rotates vertebral column | - compresses the abdomen

Question 44

erector spinae

Answer 44

- bilateral contraction extends vertebral column | - unilateral contraction rotates & laterally flexes

Question 45

internal intercostals

Answer 45

draws ribs together to depress thorax, resulting in expiration

Question 46

external intercostals

Answer 46

pulls ribs to one another to elevate thoracic cavity, resulting in inspiration

Question 47

triceps brachii

Answer 47

- extends the forearm at the elbow | - long head also extends at the shoulder

Question 48

biceps brachii

Answer 48

flexes the forearm at the elbow & supinates the forearm