major muscles

epicranius

elevation of eyebrows

orbicularis oculi

closure of eyes

orbicularis oris

protrudes the lips

platysma

draws angles of mouth downward

zygomaticus

raises corners of mouth

buccinator

compresses cheek inward

masseter, temporalis

closure of jaw

extensor digitorium

extension of digits

extensor carpi ulnaris

extension of wrist and adduction of hand

flexor digitorum profundus

flexion of digits

flexor carpi radialis

flexion of wrist and abduction of hand and wrist

biceps femoris, semimembranosus, semitendinosus

flexion of leg

rectus femoris, vastus lateralis, vastus intermedius, vastus medialis

extension of leg and knee

tibialis anterior

dorsiflexion of foot

gastrocnemius

plantar flexion

adductor magnus

adduction of thigh laterally

flexor digitorum brevis

flexes/curls toes

extensor digitorum brevis

extension of toes

external oblique

flexion of trunk

internal oblique

rotation and side bending of abdomen

transverse abdominal

tension and compression of abdominal wall

rectus abdominus

tension of abdominal wall and flexion of vertebral column

gluteus maximus

extension of thigh

pectoralis major

rotation of humerus medially and flexion of humerus

latissimus dorsi

adduction, extension, and rotation of arm at shoulder

deltoid

abduction of arm, extension and flexion of humerus

sternocleidomastoid

pulls head to side towards chest

levator scapulae

elevation of scapula