Actions Of Anterior Superficial Muscles

Front 1

temproalis

Back 1

closes jaw; elevates and retracts mandible

Front 2

masseter

Back 2

closes jaw and elevates mandible

Front 3

platysma

Back 3

depresses mandible; pulls lower lip back and down

Front 4

trapezius

Back 4

upper portion elevates shoulders; lower portion depresses shoulders

Front 5

deltoid

Back 5

prime mover of arm abduction; aids in flexion, extension and rotation of the humerous

Front 6

triceps brachii

Back 6

powerful extensor of the arm at the elbow

Front 7

biceps brachii

Back 7

poerful flexor of the arm at the elbow

Front 8

brachialis

Back 8

flexes arm at the elbow

Front 9

pronator teres

Back 9

pronates forearm

Front 10

brachioradialis

Back 10

major flexor of the arm at the elbow

Front 11

flexor carpi radialis

Back 11

powerful flexor of the wrist; abducts hand

Front 12

palmaris longus

Back 12

weak wrist flexor; tenses skin and fascia of the palm

Front 13

iliopsoas

Back 13

flexes thigh

Front 14

pectineus

Back 14

adducts, medially rotates and flexes thigh

Front 15

rectus femoris

Back 15

extend leg at the knee; fkexes thigh at hip

Front 16

vastus lateralis

Back 16

extends and stabilizes knee

Front 17

vastus medialis

Back 17

extends knee; stabilizes patella

Front 18

fibularis longus

Back 18

plantar flexes and everts foot; keeps foot flat on the ground

Front 19

extensor digitorum longus

Back 19

prime mover of toe extension

Front 20

tibialis anterior

Back 20

prime mover of dorsiflexion; inverts foot; supports arch

Front 21

epicranius, frontal

Back 21

raises eyebrows when fixed

Front 22

orbicularis oculi

Back 22

primarily controls movements of eyelids

Front 23

zygomaticus

Back 23

pulls lateral corners of mouth upward

Front 24

orbicularis oris

Back 24

closes mouth; purses and protrudes lips

Front 25

sternohyoid

Back 25

depresses hyoid when mandible is fixed

Front 26

sternocleidomastoid

Back 26

lifts head when lying on back; rotates head

Front 27

pectoralis minor

Back 27

with scapula fixed, draws ribs superiorly

Front 28

pectoralis major

Back 28

pulls arm medially (across chess); flexes arm

Front 29

serratus anterior

Back 29

abduction and raising of the arm

Front 30

external intercostals

Back 30

aids in inhalation by elevating rib cage

Front 31

internal intercostals

Back 31

aids in forced exhalation by pulling rib cage down

Front 32

rectus abdominis

Back 32

stabilizes pelvis when walking; used in sit ups

Front 33

external oblinques

Back 33

synergist of rectus abdominis; aid in truck rotation (x2)

Front 34

omterma; oblinques

Back 34

synergist of rectus abdominis; aid in truck rotation (x2)

Front 35

transversus abdominis

Back 35

compresses abdominal contents

Front 36

tensor fasciae latae

Back 36

flexes, abducts, and medially rotates and flexes thigh

Front 37

sartorius

Back 37

flexes, abducts and laterally rotates thigh

Front 38

adductor longus

Back 38

adducts, medially rotates and flexes thigh

Front 39

gracilis

Back 39

flexxes and medially rotates leg during walking

Front 40

gastrocnemius

Back 40

powerful plantar flexion; pushing off when walking

Front 41

soleus

Back 41

aid gastrocnemius in planter flexion