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Speech Therapy

Muscles of Facial Expression

QuestionAnswer
Orbicularis Oris: Description? Primary lip muscle Completely encircles oral opening No long fibers running around;short fibers overlap Composed of fibers exclusive to lips plus fibers from other facial muscles
Orbicularis Oris: Function? When activated alone, closes mouth and puckers the lips; when activated with other muscles, closes mouth in a straight line
Buccinator: Description? Principle muscle of the cheek; Deepest facial muscle
Buccinator: Origin? Origin: Pterygomandibular ligament
Buccinator: Course? Horizontal and anteriorly
Buccinator: Insertion? Fibers decussate (cross) at the corners of the mouth to insert into orbicularis oris
Buccinator: Function? Draws corners of mouth laterally
Risorius: Origin? Fascia covering masseter
Risorius: Course? Horizontally anterior; parallel and superior to buccinator
Risorius: Insertion? Skin and mucosa at corners of the mouth
Risorius: Function? Assists in drawing corners of mouth laterally
Transverse Muscles of Facial Expression? Buccinator and Risorius
Angular Muscles of Facial Expression? Zygomatic Major, Levator Labii Superior, and Depressor Labii Inferior
Zygomatic Major: Origin? Surface of zygomatic bone
Zygomatic Major: Course? Inferior and medial
Zygomatic Major: Insertion? Orbicularis oris and skin at corner of mouth
Zygomatic Major: Function? Draws corners of mouth superiorly and laterally (for broad smile)
Levator Labii Superior: Origin/Course? Origin: Lower margin of orbit/inferiorly
Levator Labii Superior: Insertion? Upper lip lateral to levator anguli oris
Levator Labii Superior: Function? proper elevator for upper lip
Depressor Labii Inferior: Origin/Course? Mandible; just lateral to midline/superiorly and medially
Depressor Labii Inferior: Insertion: Insertion: Lower lip
Depressor Labii Inferior: Function? Draws lower lip down and lateral
Vertical Muscles of Facial Expression? Levator Anguli Oris, Depressor Anguli Oris, and Mentalis
Levator Anguli Oris: Origin? Origin: Lateral to nasal ala (side of nare)
Levator Anguli Oris: Course/Insertion? Course: Inferior/Insertion: Orbicularis oris with some fibers crossing to lower lip
Levator Anguli Oris: Function? Draws corners of mouth superiorly and aids in closing lower lip
Depressor Anguli Oris: Origin/Course? Origin: Mandible; just lateral to midline/Course: superior
Depressor Anguli Oris: Insertion? Insertion: orbicularis oris with some fibers crossing to upper lip
Depressor Anguli Oris: Function? Depresses angle of lip and draws upper lip down
Mentalis: Origin/course? Origin: Mental tuberosity of the mandible/Course: superiorly
Mentalis: Insertion? Some fibers insert into chin and some into orbicularis oris
Mentalis: Function? Everts lower lip, wrinkles chin, stiffens lower lip so mouth can be closed in a straight line
What action is Depressor Anguli Oris responsible for? This muscle is responsible for frowning.
What action is Menatlis responsible for? This muscle is responsible for pouting.
As a group, what action are the Vertical Muscles responsible for? This group of muscles is responsible for smiling and frowning.
As a group, what action are the Transverse Muscles responsible for? This group of muscles is responsible for pulling the lips laterally.
Created by: wyhanes
 

 



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