Muscles of Facial Expression Flashcards
T/F:
Muscles of facial expression originate from bone and insert into the epi-dermis
False
Don’t go as far into the epi-dermis
Only go into the dermis
Which muscle of facial expression is the only muscle that isn’t paired?
Orbicularis
Who am I:
Paired frontal and occipital bellies separated by a single flat fibrous sheet- epicranial aponeurosis
Occipitofrontalis
What is the name of the muscle that is deep to occipitofrontalis and orbicularis oculi?
Corregator Succli
What is the function of corregator succuli?
Frowning
What is the function of occipitofrontalis?
Frowning
What is the name of the muscle that circles the eye?
Obicularis oculi
What is the function of orbicularis oculi?
Closes eye, squeezes, directs tear flow
What is the name of the muscle on the actual eye lid?
Palpebral part of orbicularis oculi
T/F:
Procerus muscle is an unpaired muscle with vertical fibres
False
Paired even though it doesn’t look like it
Which direction are the fibres oriented in nasalis muscle?
Horizontally
Where do the two heads of levator labii suprerioris aleque nasi insert?
One of the heads sings into alar of nostril, another head extends into upper lip
Two heads, two separate functions
Where do the muscles of the mouth insert into? How many are there?
Modiolis
7 muscles
What is modiolis and where does it extend from?
fibromuscular structure extending from skin to mucosa (palpable between finger and thumb)- anchoring point for muscles which move corners of mouth and adjacent structures
List the muscles of the mouth
Buccinator Levator anguli oris Depressor anguli oris Platysma Orbicularis oris Zygomaticus Major Risorious
T/F:
Zygomaticus minor is more lateral than Zygomaticus major
False
Major is more lateral than minor
What is the role of levator anguli oris?
Elevates the corner of the mouth
Which muscle is deep to both levator labbi superioris and zygomaticus minor?
Levator anguli oris
Where does buccinator arise and insert?
Arises from the outer surface of the maxilla and mandible and pterygomandibular raphe
Inserts into modiolis
What is the function of buccinator?
Draw in/position cheeks, direct food over molars
Who am I:
Extends from body of mandible, modiolis and modiolar muscles to insert into skin over pectoralis
Platysma
T/F:
The function of platysma is to raise the lips and mouth
False
depresses lower lip and corners mouth
T/F:
The function of depressor anguli oris is to pull the corners of the mouth down
True
Where are some of the obicularis ori fibres derived from?
Buccinators
