Lab Exam #3- Major Muscles Of The Human Head And Neck

Front 1

epicranuis

Back 1

origin- galea aponuerotica, occipital bone
insertion- skin of eyebrows, root of nose
action- raise eyebrows, pulls scalp

Front 2

orbicularis oculi

Back 2

origin- frontal bones and ligaments
insertion- tissue of eyelid
action- closes eye, blinking, squinting

Front 3

corrugator supercilii

Back 3

origin- arch of frontal bone
insertion- skin of eyebrow
action- wrinkles skin of forehead vertically

Front 4

levator labii superioris

Back 4

origin- zygomatic bone infraorbital margin of maxilla
insertion- skin and muscle of upper lip
action- raises and opens upper lip

Front 5

zygomaticus- major and minor

Back 5

origin- zygomatic bone
insertion- skin and muscle corner of mouth
action- smile

Front 6

risorius

Back 6

origin- fascia of masseter muscle
insertion- skin at angle of mouth
action- tenses lip

Front 7

depressor labii inferioris

Back 7

origin- mandible
insertion-lower lip
action- draws lower lip inferiorly

Front 8

depressor anguli oris

Back 8

origin- body of mandible below incisors
insertion- skin muscle angle of mouth
action- unhappy face

Front 9

orbicularis oris

Back 9

origin- indirectly from mandible and maxilla
insertion- muscle and skin at angles of mouth
action- kissing whistling

Front 10

mentalis

Back 10

origin- mandible below incisors
insertion- skin of chin
action- wrinkles chin

Front 11

bucinator-

Back 11

origin- molar region maxilla and mandible
insertion-orbicularis oris
action- compresses cheek as in whistling

Front 12

masseter

Back 12

origin- zygomatic arch and maxilla
insertion- angle and ramus of mandible
action- closes jaw

Front 13

temporalis-

Back 13

origin- temporal fossa
insertion-coronoid process of mandible
action- closes jaw, elevates and retracts mandible

Front 14

medial pterygoid

Back 14

origin- sphenoid
insertion- mandible near its angle
action- grinding movement of mouth

Front 15

lateral pterygoid

Back 15

origin- greater wing of sphenoid bone
insertion- mandibular condyle
action- potracts jaw, grinding movements of teeth

Front 16

platysma

Back 16

origin-fascia of chest and deltoid
insertion- lower margin of mandible,skin and muscle at corner of mouth
action- depresses mandible, pulls lower lip back and down

Front 17

sternocleidomastoid

Back 17

origin- manubrium of sternum
insertion- mastoid process
action- flexion of neck forward

Front 18

scalenes

Back 18

origin- transverse processes of cervical vertebrae
insertion- ribs 1 2
action- flex rotate neck

Front 19

digrastic

Back 19

origin- lower margin of mandible and mastoid process
insertion- tissue loop to hyloid bone
action- elevate hyoid bone, open mouth depress mandible

Front 20

stylohyoid

Back 20

origin- styloid process of mandible
insertion- hyoid bone
action- elevate hloid bone

Front 21

mylohhyoid

Back 21

origin- medial surface of mandible
insertion- hyoid bone
action- elevates hyoid bone

Front 22

sternohyoid

Back 22

origin- manubrium
insertion- hyoid bone
action- flex skull

Front 23

sternothyroid

Back 23

origin- manubrium
insertion- thyroid cartilage
action- flex skull, depresses larynx

Front 24

omohyoid

Back 24

origin- scapula
insertion- hyoid border
action- flex skull

Front 25

thyrohyoid

Back 25

origin- thyoid cartilage
insertion- hyoid
action- elevates hyoid