5-2 articulation muscles II

Question 1

muscles of the face

Answer 1

divided based on orientation of muscle fibers

orbicularis oris
transverse facial muscles
angular muscles - fibers run at an angle (mouth & up)
vertical facial muscles (vertical fibers)

all facial muscles are innervated by CN VII

Question 2

orbicularis oris

Answer 2

principle muscle acting upon the lips

origin & insertion = modiolus

closes the mouth & puckers the lips

Question 3

modiolus

Answer 3

corner of the mouth

8 muscles insert here

Question 4

transverse muscles of the face

Answer 4

buccinator - deep
risorius - superficial

pull the lips against the teeth
compress the lips
retract corners of the lips

Question 5

buccinator

Answer 5

origin - pterygomandibular ligament (between sphenoid & mandible)
insertion - orbicularis oris

pulls the lips against the teeth
compress lips

important muscle for chewing

Question 6

risorius

Answer 6

on top of the buccinator

origin - fascia of the masseter (surface)
insertion - modiolus

primarily retracts the corners of the mouth

smile muscle

Question 7

angular muscles

Answer 7

labial elevators - elevate upper lip
labial depressors

Question 8

levator labii superioris

Answer 8

origin -lower margin of the orbit of the maxillae
insertion - upper lip

elevates upper lip

Question 9

levator labii superioris alaeque nasi

Answer 9

origin - frontal & orbital process of maxillae
insertion - lateral part of nostril & upper lip

elevate upper lip & flare nostril

Elvis Presley muscle

Question 10

zygomatic minor

Answer 10

origin - facial process of zygomatic bone
insertion - upper portion of orbicularis orbit

elevate upper lip

Question 11

zygomatic major

Answer 11

origin - facial process of zygomatic bone
insertion - modiolus

draw corner of mouth up & back

inferior to zygomatic minor

Question 12

depressor labii inferioris

Answer 12

origin - oblique line of mandible
insertion - lower lip (orbicularis oris)

draw lower lip downward

Question 13

vertical muscles

Answer 13

mentalis
depressor anguli oris
levator anguli oris

compress the lips & assist in elevating & lowering them

Question 14

mentalis

Answer 14

origin - mandible
insertion - skin of the chin

elevates & wrinkles the chin, pulls lower lip out (pouting)

Question 15

depressor anguli oris

Answer 15

origin - mandible
insertion - modiolus

depresses the corner of the mouth (frowning)
assists in lowering lips
compresses lips w/ other vertical muscles

Question 16

levator anguli oris

Answer 16

origin - maxilla
insertion - modiolus

elevates the corners of the mouth

Question 17

epicranial aponeurosis

Answer 17

sheet of tendon like material

covers upper part of cranium

attached behind occipital protuberance & forms a short & narrow prolongation between its union w/ the frontalis

Question 18

platysma

Answer 18

origin - broad fascia covering the pectoralis major & deltoid muscles
insertion - mandible

draws lower lip & corner of mouth down, opening the mouth

Question 19

epicranius

Answer 19

broad layer covering the whole of one side of the vertex of the skull
occipital bone –> eyebrow

occipitalis & frontalis

Question 20

frontalis

Answer 20

frontal belly

raises the eyebrows
draws scalp forward

expression of surprise

Question 21

occipitales

Answer 21

occipital belly

draws the scalp backwards

expression of surprise

Question 22

orbicularis oculi

Answer 22

origin - nasal part of frontal bone & frontal process of maxilla

form the eyelids

only muscles that closes the eyes

Question 23

corrugator supercilii

Answer 23

deep to the frontalis

origin - nasal bridge
insertion - skin of forehead

draws eyebrows down & medially

frowning muscle

Question 24

smiling muscles

Answer 24

orbicularis oculi
zygomatic major & minor
levator labii superioris
levator anguli oris
risorius

Question 25

intrinsic tongue muscles

Answer 25

origin & insertion inside the tongue

change the shape of the tongue

innervated by CNXII

Question 26

superior longitudinal

Answer 26

located just beneath mucous membrane of tongue

origin - base of tongue near epiglottis
insertion - tip & sides of tongue

shortens tongue & turns tip upward

Question 27

inferior longitudinal

Answer 27

undersurface of tongue

origin - root
inserion - tip

shortens the tongue & pulls tip down

Question 28

transverse muscle of the tongue

Answer 28

origin - median septum
insertion - lateral margins of the tongue

narrows & elongates the tongue

Question 29

vertical

Answer 29

origin - base
insertion - mucous membrane

no fibers on tongue midline

flattens the tongue

Question 30

extrinsic tongue muscles

Answer 30

origin - adjacent structure
insertion - tongue

changes shape & position of tongue

Question 31

genioglossus

Answer 31

origin: internal surface of mandible
insertion: tongue

contraction produces a range of tongue movements

Question 32

styloglossus

Answer 32

origin: styloid process of temporal bone
insertion: sides of the tongue

draws sides of tongue up & back

Question 33

hyoglossus

Answer 33

origin: hyoid bone
insertion: posterior sides of tongue

retracts & depresses the tongue

Question 34

palatoglossus

Answer 34

origin: posterior surface of hard palate
insertion: sides of tongue

raise & retract sides & back of tongue
lowers soft palate if tongue is fixed

CNX