Muscular System - Muscles And Actions

Front 1

buccinator

Back 1

compresses cheek; whistling and sucking

Front 2

corrugator supercilii

Back 2

draws eyebrows medially and inferiorly; wrinkles skin of forehead

Front 3

depressor anguli oris

Back 3

draws corners of mouth down and laterally; a grimace (zygomaticus antagonist)

Front 4

dpressor labii inferioris

Back 4

draws lower lips inferiorly

Front 5

frontalis

Back 5

raises the eyebrows; wrinkles forehead skin horizontally

Front 6

levator labii superioris

Back 6

opens lips; raises and furrows upper lip

Front 7

masseter

Back 7

prime mover of jaw closure; elevates mandible

Front 8

mentalis

Back 8

wrinkles chin; protrudes lower lip (pouting)

Front 9

occipitalis

Back 9

fixes aponeurosis and pulls scalp posteriorly

Front 10

orbicular oculi

Back 10

closes eyes; produces blinking and squinting; draws eyebrows inferiorly

Front 11

orbicularis oris

Back 11

closes lips; purses and protrudes lips; kissing and whistling

Front 12

platysma

Back 12

tenses skin of neck

Front 13

trapezius

Back 13

stabilizes, elevates, retracts, and rotates scapula

Front 14

zygomaticus major and minor

Back 14

raises lateral corners of mouth

Front 15

biceps brachii

Back 15

flexes and supinates forearm (open a bottle of wine - turn corkscrew and pull cork)

Front 16

brachilalis

Back 16

a major forearm flexor

Front 17

coracobrachialis

Back 17

flexes and adducts arm (synergist of pectoralis major)

Front 18

deltoid

Back 18

prime mover arm abduction

Front 19

external intercostals

Back 19

pull ribs towards one another to elevate rib cage

Front 20

external oblique

Back 20

flex vertebral column and compress abdominal wall; rotating trunk and flexes laterally

Front 21

internal intercostals

Back 21

draws ribs together and depress rib cage

Front 22

internal oblique

Back 22

flex vertebral column and compress abdominal wall; rotating trunk and flexes laterally

Front 23

latissimus dorsi

Back 23

prime mover of arm extension; powerful arm adductor; medially rotates arm at shoulder

Front 24

pectoralis major

Back 24

adducts and medially rotates arm

Front 25

pectoralis minor

Back 25

with ribs fixed, draws scapula forward and downward

Front 26

rectus abdominis

Back 26

flex and rotate lumbar region of vertebral column

Front 27

rhomboids

Back 27

stabilize scapula

Front 28

serratus anterior

Back 28

rotates scapula so its inferior angle moves laterally and upward

Front 29

subscalularis

Back 29

chief medial rotatir of arm

Front 30

teres major

Back 30

extends, medially rotates, and adducts arm

Front 31

teres minor

Back 31

rotates arm laterally

Front 32

transverse abdominis

Back 32

compresses abdominal contents

Front 33

brachioradialis

Back 33

synergist in flexing forearm

Front 34

extensor carpi radialis longus

Back 34

extends hand

Front 35

extensor digitorum

Back 35

prime mover of finger extension

Front 36

flexor carpi radialis

Back 36

powerful flexor and abductor of hand

Front 37

flexor carpis ulnaris

Back 37

powerful flexor and adductor of hand

Front 38

flexor digtorum superficialis

Back 38

flexes wrist and middle phalanges of second to fifth fingers

Front 39

flexor pollicis longus

Back 39

flexes distal phalanx of thumb

Front 40

palmaris longus

Back 40

tenses skin and fascia of palm during hand movement

Front 41

pronator quadratus

Back 41

prime mover of forearm pronation

Front 42

pronator teres

Back 42

pronates forearm

Front 43

supinator

Back 43

assists biceps brachii to forcibly supinate forearm

Front 44

triceps brachii

Back 44

powerful forearm extensor

Front 45

adductors

Back 45

allow you to draw your legs to the midline of your body, as when standing at attention

Front 46

biceps femoris

Back 46

extends thigh and flexes leg

Front 47

extensor digitorum longus

Back 47

prime mover of toe extension

Front 48

fibularis brevis

Back 48

plantar flexes and everts foot

Front 49

fibularis longus

Back 49

plantar flexes and everts foot

Front 50

flexor hallucis longus

Back 50

plantar flexes and inverts foot; flexes great toe at all joints; "push off" muscle during walking

Front 51

gastrocnemius & soleus

Back 51

plantar flexes foot

Front 52

gluteus maximus

Back 52

major extensor of thigh when climbing stairs

Front 53

gluteus medius & tensor fasciae latae

Back 53

move thigh laterally to take the "at ease" stance

Front 54

rectus femoris

Back 54

extends knee and flexes thigh

Front 55

semimembranous & semitendinous

Back 55

extend thigh and flex knee

Front 56

tibialis anterior

Back 56

prime mover of ankle dorsiflexion

Front 57

tibialis posterior

Back 57

major foot inverter

Front 58

vastus lateralis

Back 58

extends and stabilizes leg