muscle actions

Question 1

frontalis belly of the epicranius

Answer 1

pulls scalp forward, wrinkles forehead and raises eyebrows

Question 2

occipitalis belly of the epicranius

Answer 2

draws scalp backward, wrinkles forehead and raises eyebrows

Question 3

palpebral part of the orbicularis oculi

Answer 3

closes area of eyelid

Question 4

orbital part of the orbicularis oculi

Answer 4

closes area beyond eyelid toward orbit

Question 5

corrugator supercilii

Answer 5

draws eyebrow medial and down (forms furrow between)

Question 6

procerus

Answer 6

depresses eyebrow medially

Question 7

compressor naris

Answer 7

compresses cartilage at bridge of nose

Question 8

dilitator naris

Answer 8

widens, dilates the nostrils and anterior nasal aperture

Question 9

depressor septi

Answer 9

widens nostrils

Question 10

orbicularis oris

Answer 10

closes mouth, purse and protrude lips

Question 11

risorius

Answer 11

draws back angle of mouth

Question 12

buccinator

Answer 12

compresses cheek against teeth

Question 13

levator labii superioris

Answer 13

raises and everts upper lip

Question 14

levator labii superioris alaeque nasi

Answer 14

raises and everts upper lip, dilates nostril

Question 15

zygomaticus minor

Answer 15

raises upper lip, produces nasolabial groove

Question 16

zygomaticus major

Answer 16

draws angle of mouth up and out

Question 17

depressor anguli oris

Answer 17

draws corners of mouth down and out

Question 18

depressor labii inferioris

Answer 18

draws lower lip down

Question 19

mentalis

Answer 19

raises and protrudes lower lip

Question 20

levator palpebrae superior

Answer 20

elevates upper eyelid

Question 21

superior rectus

Answer 21

elevates and adducts cornea; intorsion

Question 22

inferior rectus

Answer 22

depresses and adducts the cornea; extorsion

Question 23

lateral rectus

Answer 23

abduct the eyeball

Question 24

medial rectus

Answer 24

adduct the eyeball

Question 25

superior oblique

Answer 25

depress and abduct cornea; intorsion

Question 26

inferior oblique

Answer 26

elevate and abduct cornea; extorsion

Question 27

masseter

Answer 27

elevate and protract mandible ( clench teeth)

Question 28

temporalis

Answer 28

elevate, retract mandible (clench teeth)

Question 29

lateral pterygoid

Answer 29

protrude mandible, pulls disc forward, depress chin and assist in gliding or rotary movement

Question 30

medial pterygoid

Answer 30

elevate and protract mandible, assist in gliding or rotary movement

Question 31

posterior auricular

Answer 31

draw ears back

Question 32

anterior auricular

Answer 32

elevate and pull ear forward

Question 33

superior auricular

Answer 33

elevate ear

Question 34

temporoparietalis

Answer 34

tighten scalp, draw back skin over temples