Muscles of Facial Expression

Question 1

all muscles of facial expression are supplied by which cranial nerve?

Answer 1

CN7 - Facial

Question 2

what cranial nerve innervates facial sensation?

Answer 2

trigeminal nerve - CN5

Question 3

what are the 3 groups of facial muscles?

Answer 3

orbital, nasal, and oral

Question 4

what are the 2 main muscles of the orbital group? name their sub muscles

Answer 4

orbicularis oculi containing
1. palpebral orbicularis
2. lacrimal orbicularis
3. orbital orbicularis
and corrugator supercilli

Question 5

function of orbicularis oculi

Answer 5

ctrls movement of eyelids and eyebrows

Question 6

function of corrugator supercilli

Answer 6

brings brows together (frown)

Question 7

function of palpebral orbicularis

Answer 7

closes eyelids

Question 8

function of lacrimal orbicularis

Answer 8

facilitates tear drainage

Question 9

function of orbital orbicularis

Answer 9

closes eyes tightly

Question 10

what is myasthenia gravis and which muscle is MOST affected?

Answer 10

chronic autoimmune disease causing muscle weakness. most affected muscle is the orbital orbicularis

Question 11

what are the muscles of the nasal group?

Answer 11

1. nasalis transverse
2. nasalis alar
3. procerus
4. depressor nasi septi

Question 12

location & function of nasalis transverse

Answer 12

location: arises from maxilla and attaches to aponeurosis across dorsum of nose
function: compresses nostrils

Question 13

location & function of nasalis alar

Answer 13

location: originates from maxilla
function: flares nostrils

Question 14

location & function of procerus

Answer 14

location: most superior nasal muscle located between brows
function: pulls skin between brows down and flares nostrils

Question 15

location & function of depressor nasi septi
relevant surgical procedure

Answer 15

location: arises from maxilla
function: pulls tip of nose down
-sevored during rhinoplasty to correct droopy tip

Question 16

2 main muscles of oral group

Answer 16

1. orbicularis oris
2. buccinator

Question 17

function of orbicularis oris

Answer 17

encloses oral cavity opening

Question 18

function of buccinator
what condition affects its function

Answer 18

help mastication & blowing
bells palsy

Question 19

upper group of oral muscles

Answer 19

risorious
zygomaticus major and minor
levator labii superioris
levator labii superioris alaque nasi
levator anguli oris

Question 20

lower group of oral muscles

Answer 20

depressor anguli oris
depressor labii inferioris
mentalis

Question 21

location and function epicranius facial muscle (not apart of any category)

Answer 21

location: large muscle covering top of skull
function: raises brows and wrinkles forehead

Question 22

temporoparietalis location (not apart of any category)

Answer 22

muscle on side of head that does from ear to epicranial aponeurosis

Question 23

platysma location (not apart of any category)

Answer 23

broad sheet arising from fascia of pectoralis major and deltoid

Question 24

where does CN7 arise from

Answer 24

pons of brainstem

Question 25

what can cause loss of function of CN7 and what does it result in

Answer 25

stroke can cause loss of function and results in loss of function of all facial muscles

Question 26

bells palsy

Answer 26

condition affecting facial nerve
causes twitching, weakness, and loss of movement
usually temporary but can be permanent

Question 27

what are the muscles of mastication?

Answer 27

1. masseter
2. temporalis
3. medial pterygoid
4. lateral pterygoid

Question 28

masseter description & function

Answer 28

paired, strong and thick muscle that has a deep and superficial part
function: chewing/biting down

Question 29

temporalis description and function

Answer 29

on each side of head filling temporal fossa and covers most of temporal bone
function: closes and retracts jaw during chewing

Question 30

medial pterygoid description & function

Answer 30

thick muscle connecting mandible with maxilla, sphenoid, and palatine bones
function: closes jaw & grinds teeth

Question 31

lateral pterygoid function

Answer 31

opens jaw and grinds food