4.1 MAJOR FACIAL MUSCLES
Orbicularis oculi- function
-Closes the eye -Winking.
Levator labii superioris alaeque nasi- function
An elevator to the medial upper lip.
Depressor anguli oris-location
Attaches to the corners of the mouth and is oriented inferiorly and medially.
Orbicularis oculi- location
Circular muscle surrounding the eye
Orbicularis oris- location
Circular muscle surrounding the lips
Orbicularis oris- function
Closes mouth, compresses and protrudes the lips (the kissing muscle!)
Nasalis- function
Compresses & dilates nostrils
Depressor septor nasi- function
Constricts + opens nostrils
Occipitalis- function
Draws back scalp, wrinkles forehead
Corrugator supercilii- function
Draws eyebrows together
Depressor anguli oris- function
It draws the corners of the mouth down and medially (a 'sad' muscle).
Buccinator- function
It presses the cheeks against the back teeth chewing (mastication) Prevents food accum. in area
Zygomatic major- function
draws mouth angle upward and outward
Orbicularis oris- structure
either single muscle or pairs -superior -inferior
Levator anguli oris- function
elevates the corner of the mouth- pulls it medially
Levator anguli oris- location
hidden beneath Levator labii superiors.
Platysma- function
depress mandible draws lips down tenses skin of lower face + neck
Mentalis- function
depresses the lower lip (pulls it out)
Procerus- location
Above the nose
Procerus- function
pulls eyebrows downward
Risorius- function
Retracts corners of the mouth.
Zygomatic major- location
(larger) and lateral to zygomatic minor
Depressor septor nasi- location
Either side of nasal septum
Temporalis- function
Elevates and retracts mandible assists in side to side movement of mandible
Masseter- function
Elevates mandible when chewing and slightly protracts it
Buccinator- location
Found deep to risorius and zygomatic major. Runs from corner of mouth to PGM ligament.
Masseter- location
From lower mandible to cheekbone
Buccinator + Risorius- function
Help keep food on the molars during chewing.
MUSCLE ELEVATORS OF UPPER LIP (inwards out)
Levator Labii Superioris Alaeque Nasi Levator Labii Superioris Zygomatic minor
Nasalis- location
On the nose
Corrugator supercilii- location
Posterior to obicularis oculi
Levator labii superioris alaeque nasi- location
Runs down the side of the nose to the medial upper lip.
Depressor anguli oris- location
Runs from mandible to corner of mouth.
Orbicularis oris- type of muscle?
Sphincter muscle round- maintains constriction
Risorius- location
Superficial to the buccinator runs from corner of the mouth and angling --slightly upwards to masseter
Mentalis- location
a small muscle in the most medial section of the lower jaw
Depressor labii inferioris- function
and draws the lower lip downwards
Depressor labii inferioris- location
attaches from the mandible to the lower lip pulls the lips downward and out
Zygomatic minor- location
lateral to levator labii superioris
Levator labii superioris- location
lateral to levator labii superioris alaeque nasi
Levator labii superioris- function
lip elevator
Zygomatic minor- function
lip elevator
Platysma- location
superficial muscle sheet, extends from inferior border of lower jaw down + across most of neck region.