muscle origin, insertion, and action (no pictures)

frontal belly

origin:

insertion:

action:

epicranial aponeurosis

eyebrow skin

raises eyebrows

occipital belly

origin:

insertion:

action:

occipital bone

epicranial aponeurosis

pulls scalp posteriorly

orbicularis oculi

origin:

insertion:

action:

frontal bone

eyelid

close eye

zygomaticus major

origin:

insertion:

action:

zygomatic bone

tissue at angle of mouth

raises angle of mouth

zygomaticus minor

origin:

insertion:

action:

zygomatic bone

tissue at angle of mouth

raises angle of mouth

orbicularis oris

origin:

insertion:

action:

maxilla

lips

compresses lips

buccinator

origin:

insertion:

action:

maxilla
orbicularis oculi

compresses cheek

masseter

origin:

insertion:

action:

zygomatic bone

mandible

jaw closure

temporalis origin

origin:

insertion:

action:

temporal bone

mandible

jaw closure

platysma

origin:

insertion:

action:

chest fascia

mandible

tenses neck skin

sternocleidomastoid

origin:

insertion:

action:

clavicle

mastoid process of temporal bone

neck flexion

pectoralis major

origin:

insertion:

action:

clavicle

humerus

arm flexion

pectoralis minor

origin:

insertion:

action:

ribs

coracoid process of the scapula

inferior scapular movement

serratus anterior

origin:

insertion:

action:

ribs

scapula

abduction of scapula

deltoid

origin:

insertion:

action:

clavicle

deltoid tuberosity of humerus

abduction of arm

external intercostals

origin:

insertion:

action:

inferior border of above rib

superior border of below rib

pull rib together elevate

internal intercostals

origin:

insertion:

action:

superior border of rib below

inferior border of rib above

rib together depress

diaphragm

origin:

insertion:

action:

sternum

central tendon

inspiration

rectus abdominis

origin:

insertion:

action:

pubic bone

xiphoid process of sternum

rotate vertebral column

external oblique

origin:

insertion:

action:

ribs

pubic bone

compresses abdominal wall

internal oblique

origin:

insertion:

action:

ilium

pubic bone

compress ab wall

transversus abdominis

origin:

insertion:

action:

ilium

pubic bone

compress ab content

trapezius

origin:

insertion:

action:

thoraci vertebrae

scapula acromion

ADduct scapula

latissimus dorsi

origin:

insertion:

action:

lumbar spinous process

humerus

arm extension

infraspinatus

origin:

insertion:

action:

scapula

greater tubercle humerus

lateral arm rotation

teres minor

origin:

insertion:

action:

scapula

greater tubercle of humerus

lateral arm rotation

supraspinatus

origin:

insertion:

action:

scapula

greater tubercle of humerus

initiate arm abduction

teres major

origin:

insertion:

action:

scapula

humerus

adduct arm

rhomboids major

origin:

insertion:

action:

spinous process T2-T5

scapula

stabilize scapula

rhomboids minor

origin:

insertion:

action:

spinous process C7-T1

medial scapula

stabilize scapula

triceps brachii

origin:

insertion:

action:

glenoid cavity of scapula

olecranon of ulna

extension of forearm

biceps brachii

origin:

insertion:

action:

glenoid cavity of scapula

radial tuberosity of radius

flexion of forearm

brachioradialis

origin:

insertion:

action:

humerus

radial styloid process of radius

forearm flexion synergist

brachialis

origin:

insertion:

action:

humerus

coronoid process of ulna

flex forearm

pronator teres

origin:

insertion:

action:

medial epicondyle of humerus

radius

pronate forearm

flexor carpi radialis

origin:

insertion:

action:

medial epicondyle of humerus

metacarpals

abductor of hand

palmaris longus

origin:

insertion:

action:

medial epicondyle of humerus

skin of palm

tenses skin of palm

flexor carpi ulnaris

origin:

insertion:

action:

medial epicondyle of humerus

carpals

adducts hand

extensor carpi radialis longus (ECRL)

origin:

insertion:

action:

humerus

metacarpals

abducts hand

extensor carpi radialis brevis

origin:

insertion:

action:

lateral epicondyle of humerus

metacarpals

abducts hand

supinator

origin:

insertion:

action:

lateral epicondyle of humerus

radius

supinates forearm

extensor digitorum

origin:

insertion:

action:

lateral epicondyle of humerus

phalanges

finger extension

extensor carpi ulnaris

origin:

insertion:

action:

lateral epicondyle of humerus

metacarpals

adducts hand

iliopsoas origin 68

origin:

insertion:

action:

ilium

lesser trochanter of femur

flex thigh

sartorius

origin:

insertion:

action:

ilium

tibia

flexe thigh

adductor magnus 72

origin:

insertion:

action:

ischium

linea aspera of femur

flexes thigh

adductor longus 70

origin:

insertion:

action:

pubis

linea aspera of femur

flexes thigh

gracilis

origin:

insertion:

action:

pubis

medial condyle of tibia

flexes leg

rectus femoris

origin:

insertion:

action:

ilium

tibial tuberosity

flex thigh

vastus lateralis

origin:

insertion:

action:

greater trochanter of femur

tibial tuberosity

extends leg

vastus medialis

origin:

insertion:

action:

linea aspera of femur

tibial tuberosity of tibia

extends leg

vastus intermedius

origin:

insertion:

action:

femur

tibial tuberosity

extends leg

tensor fascia latae

origin:

insertion:

action:

ilium

iliotibial tract

steadies trunk

biceps femoris

origin:

insertion:

action:

ischium

lateral condyle of tibia

extends thigh

semitendinosus

origin:

insertion:

action:

ischium

tibia

extends thigh

semimembranosus

origin:

insertion:

action:

ischium

lateral condyle of tibia

extends thigh

gluteus maximus

origin:

insertion:

action:

ilium

femur

thigh extensor

gluteus medius

origin:

insertion:

action:

ilium

greater trochanter of femur

abducts thigh

tibalis anterior

origin:

insertion:

action:

lateral condyle of tibia

tarsals

dorsiflexion

extensor digitorum longus on leg

origin:

insertion:

action:

fibula

foot phalanges

toe extension prime mover

gastrocnemius

origin:

insertion:

action:

medial condyles of femur

calcaneus via calcaneal tendon

plantar flexes

soleus

origin:

insertion:

action:

tibia

calcaneus via calcaneal tendon

plantar flexion

popliteus

origin:

insertion:

action:

lateral condyle of femur

tibia

medial rotation

tibalis posterior

origin:

insertion:

action:

tibia

tarsals

foot inversion prime mover

flexor digitorum longus

origin:

insertion:

action:

tibia

foot phalanges

toe flexion