muscle actions

buccinator

compresses cheek

frontalis

wrinkle forehead, raises eyebrows

masseter

Elevates Mandibles

occipitalis

Anchors scalp posteriorly

orbicularis oculi

close eye

orbicularis oris

closes lips

Platysma

pulling down the mandible

sternocleidomastoid

flexes and laterally rotates head

temporalis

elevates and retracts mandible

zygomaticus major

raises corner of mouth

diaphragm

Flattens to open thoracic cavity with inhalation

erector Spinae (group)

extend and laterally flex trunk

external oblique

flexes and laterally rotates trunk

infraspinatus

laterally rotates arm

internal oblique

flexes and laterally rotates trunk

latissimus dorsi

extends and adducts arm

pectoralis major

adducts and medially rotates arm

pectoralis minor

draws scapula downward and forward

rectus abdominis

flexes and rotates trunk

rhomboid major

retracts scapula

serratus anterior

protracts scapula

Subscapularis

medially rotates arm

supraspinatus

abducts arm

transversus Abdominis

compresses abdomen

trapezius

Elevates, retracts, and rotates scapula

biceps brachii (short & long head)

flexes and supinates forearm

brachialis

flexes forearm

brachioradialis

flexes forearm

deltoid

abducts arm

extensor carpi radials brevis/longus

extend and abducts hand

extensor carpi ulnaris

extends and abducts hand

extensor digitorum

extends fingers

flexor carpi ulnaris

flexes and adducts hand

palmaris longus

tenses palmar fascia

pronates teres

pronates forearm

triceps brachii (long, lateral & medial head)

extends forearm

Adductor longus

adducts and medially rotates thighs

adductor magnus

adducts and medially rotates thighs

biceps femoris

extends thighs and flexes leg

extensor digitorum longus

extends toes

fibularis longus

plantar flexes and everts foot

gastrocnemius

plantar flexes foot

gluteus maximus

extends thigh

gluteus medius

abducts and medially rotates thigh

gracilis

abducts and medially rotates thigh

iliopsoas (illiacus + psoas major)

flexes thigh

rectus femoris

flexes thigh and extends leg

sartorius

flexes, abducts, and laterally rotates thigh

semimembranosus

extends thigh and flexes leg

semitendinosus

extends thigh and flexes leg

soleus

plantar flexes foot

tensor fasciae lata

flexes and abducts thigh

tibialis anterior

dorsiflexes and inverts foot

vastus intermedius

extends leg

vastus lateralis

extends leg

vastus medialis

extends leg