origin/insertion and actions of muscles

masster actions

elevation and protraction of the TMJ

buccinator action

compresses cheek during chewing

temporalis action

elevation and retraction of TMJ

frontalis/occipitalis action

raises eyebrows

orbicularis oculi action

closes eyelids

orbicularis oris action

closes mouth and protrudes lips

zygomaticus major action

elevates corners of mouth

zygomaticus minor action

elevation of upper lip

sternocleidomastoid origin/insertion

manubrium of sternum and clavicle/mastoid process of temporal and occipital bone

sternocleidomastoid actions

bilateral foward flexion of neck and extension of head, unilateral contralateral rotation of the neck

splenius capitus & cervicis origin/insertion

c7 to t3/mastoid process of temporal and occipital bone

splenius capitus & cervicis actions

bilateral extension of neck, unilateral ipsilateral rotation of neck

rectus abdominis origin/insertion

pubis/xiphoid process of sternum

rectus abdominus action

flexion of torso

external oblique origin/insertion

lower ribs/iliac crest of ilium

external oblique actions

bilateral foward flexion of torso, unilateral rotation of torso

internal oblique origin/insertion

iliac crest of ilium/lower ribs and linea alba

internal oblique actions

bilateral forward flexion of torso, unilateral ipsilateral rotation of torso

trapezius origin/insertion

occipital bone and all thoracic vertebrae/spine, acromion of scapula, clavicle

trapezius action

stabilizes scapula

pectoralis major origin/insertion

clavicle and sternum/intertubercular sulcus of humerus

pectoralis major actions

flexion, adduction, and medial rotation of arm

latissimus dorsi insertion

intertubercular sulcus of humerus

latissimus dorsi actions

extension, adduction, medial rotation of arm

deltoid origin/insertion

acromion of scapula/deltoid tuberosity of humerus

deltoid action

abduction of arm

supraspinatus origin/insertion

supraspinous fossa of scapula/greater tubercle of humerus

supraspinatus action

abduction of arm

teres minor origin/insertion

lateral border of scapula/greater tubercle of humerus

teres minor actions

lateral rotation and adduction of arm

subscapularis origin/insertion

subscapular fossa of scapula/lesser tubercle of humerus

subscapularis action

medial rotation of arm

biceps brachii origin/insertion

scapula/tuberosity of radius

biceps brachii action

flexion of the forearm

brachialis origin/insertion

humerus/ulna

brachialis action

synergist in flexion of forearm

brachioradialis origin/insertion

humerus/styloid process of radius

brachioradialis action

synergist in flexion of forearm

triceps brachii origin/insertion

scapula and humerus/olecranon of ulna

triceps brachii actiions

extension of forearm and extension of arm

gluteus maximus origin/insertion

ilium, sacrum, coccyx/gluteal tuberosity of femur

gluteus maximus actions

extension, lateral rotation, abduction of thigh

iliopsoas origin/insertion

iliacus: iliac fossa of ilium, psoas major: t12 and lumbar vertebrae/lesser trochanter of femur

iliopsoas action

flexion of thigh

sartorius origin/insertion

ilium/tibia

sartorius actions

flexion, abduction, lateral rotation of the thigh and flextion of the leg

rectus femoris origin/insertion

ilium/tibial tuberosity

rectus femoris actions

extension of leg and flexion of thigh

vastus lateralis origin/insertion

greater trochanter of femur, linea aspera of femur/tibial tuberosity

vastus lateralis action

extension of leg

vastus medialis origin/insertion

intertrochanteric line of femur, linea aspera of femur/tibial tuberosity

vastus medialis action

extension of leg

vastus intermedius origin/insertion

femur/tibial tuberosity

vastus intermedius action

extension of leg

gracilis origin/insertion

pubis/tibia

gracilis actions

flexion of the leg, adduction of the thigh

biceps femoris origin/insertion

ischium and femur/head of fibula

biecps femoris actions

flexion of the leg and extension of thigh

semimembranosus origin/insertion

ischial tuberosity/medial condyle of tibia

semimembranosus actions

flexion of leg and extension of thigh

semitendinosus origin/insertion

ischial tuberosity/tibia

semitendinosus actions

flexion of leg and extension of thigh

tibialis anterior origin/insertion

tibia/metatarsal 1 and medial cuneiform

tibialis anterior actions

dorsiflexion of foot and inversion of foot

gastrocnemius origin/insertion

medial and lateral condyles of femur/calcaneus

gastrocnemius actions

plantarflexion of foot and flexion of leg at the knee

soleus origin/insertion

tibia and fibula/calcaneus

soleus action

plantarflexion of foot

infraspinatus origin/insertion

infraspinous fossa of scapula/greater tubercle of humerus

infraspinatus actions

lateral rotation and adduction of arm