Actions of Muscles

Question 1

Occipitofrontalis

Answer 1

Raises eyebrows, draws scalp anteriorly

Question 2

Orbicularis oculi

Answer 2

Closes eyelids as blinking or squinting

Question 3

Orbicularis oris

Answer 3

Closes mouth, protrudes and purses lips

Question 4

Platysma

Answer 4

Draws an angle of mouth downward, synergist for depression of mandible

Question 5

Masseter

Answer 5

Elevates mandible

Question 6

Temporalis

Answer 6

Elevates mandible

Question 7

Medial pterygoid

Answer 7

Elevates mandible and moves it side to side

Question 8

Lateral pterygoid

Answer 8

Depresses mandible and moves it side to side

Question 9

Digastric

Answer 9

Depresses mandible

Question 10

Sternocleidomastoid

Answer 10

Flexes neck, rotates head to shoulder on opposite side, lateral flexion

Question 11

Trapezius

Answer 11

Extends neck, retracts, fixes , elevates and depresses scapula

Question 12

Pectoralis minor

Answer 12

Draws scapular anteriorly and inferiorly, elevates ribs during deep inspiration

Question 13

Internal intercostals

Answer 13

Depress rib cage during expiration

Question 14

External intercostals

Answer 14

Elevate rib cage during inspiration

Question 15

Pectoralis major

Answer 15

Flexion, adducts and medially rotates upper arm

Question 16

Teres major

Answer 16

Extends, adducts, and medially rotates upper arm

Question 17

Latissimus dorsi

Answer 17

Extends, adducts, and medially rotates upper arm

Question 18

Deltoid

Answer 18

Flexes, extends, abducts, medially, and laterally rotates arm

Question 19

Subscapularis

Answer 19

Medially rotates humerus

Question 20

Infraspinatus

Answer 20

Laterally rotates humerus

Question 21

Teres minor

Answer 21

Laterally rotates humerus

Question 22

Supraspinatus

Answer 22

Initiates abduction of shoulder/humerus; stabilizes shoulder joint

Question 23

Biceps brachii

Answer 23

Flexes and supinates forearm

Question 24

Triceps brachii

Answer 24

Extends forearm

Question 25

Brachialis

Answer 25

Flexes forearm

Question 26

Supinator

Answer 26

Supinates forearm

Question 27

Pronator teres

Answer 27

Pronates forearm

Question 28

Brachioradialis

Answer 28

Flexes forearm at elbow

Question 29

Flexor carpi radialis

Answer 29

Flexes and abducts hand

Question 30

Palmaris longus

Answer 30

Weak wrist flexor

Question 31

Extensor digitorum

Answer 31

Extends digits 2-5

Question 32

Flexor digitorum superficialis

Answer 32

Flexes digits 2-5

Question 33

External oblique

Answer 33

Flexes vertebral column, fixes and depresses ribs, rotates trunk, compresses anterior abdominal wall

Question 34

Internal oblique

Answer 34

Flexes vertebral column, fixes and depresses ribs, rotates trunk, compresses anterior abdominal wall

Question 35

Transversus abdominis

Answer 35

Compresses anterior abdominal wall

Question 36

Rectus abdominis

Answer 36

Flexes vertebral column; increases abdominal pressure and fixes and depresses ribs

Question 37

Erector spinae

Answer 37

Prime mover for back extension

Question 38

Iliopsoas

Answer 38

Flexes trunk at thigh; major flexor of hip

Question 39

Tensor fasciae latae

Answer 39

Extends knee via iliotibial tract; upright postural control

Question 40

Adductor longus

Answer 40

Adducts, flexes and laterally rotates thigh

Question 41

Gracilis

Answer 41

Adducts thigh and flexes leg at knee

Question 42

Gluteus medius

Answer 42

Abducts and medially rotates thigh

Question 43

Gluteus maximus

Answer 43

Powerfully extends and laterally rotates thigh

Question 44

Sartorius

Answer 44

Flexes leg; flexes, abducts and laterally rotates thigh

Question 45

Biceps femoris

Answer 45

Extends thigh, flexes leg

Question 46

Semitendinosus

Answer 46

Extends thigh and flexes leg; medially rotates leg

Question 47

Semimembranosus

Answer 47

Extends thigh; flexes knee; medially rotates leg

Question 48

Rectus femoris

Answer 48

Extends leg and flexes thigh

Question 49

Vastus lateralis

Answer 49

Extends leg

Question 50

Vastus medialis

Answer 50

Extends leg

Question 51

Vastus intermedius

Answer 51

Extends leg

Question 52

Tibialis anterior

Answer 52

Dorsiflexes and inverts of foot

Question 53

Extensor digitorum longus

Answer 53

Extends toes, dorsiflexes foot, everts foot

Question 54

Flexor digitorum longus

Answer 54

Flexes toes, plantar flexes and inverts foot

Question 55

Gastrocnemius

Answer 55

Flexes leg; plantar flexes foot

Question 56

Soleus

Answer 56

Plantar flexes foot

Question 57

FIbularis longus

Answer 57

Plantar flexes and everts foot