Muscles of Facial Expression
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| 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
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| Orbicularis Oris: Function? | When activated alone, closes mouth and puckers the lips; when activated with other muscles, closes mouth in a straight line
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| Buccinator: Description? | Principle muscle of the cheek;
Deepest facial muscle
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| Buccinator: Origin? | Origin: Pterygomandibular ligament
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| Buccinator: Course? | Horizontal and anteriorly
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| Buccinator: Insertion? | Fibers decussate (cross) at the corners of the mouth to insert into orbicularis oris
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| Buccinator: Function? | Draws corners of mouth laterally
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| Risorius: Origin? | Fascia covering masseter
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| Risorius: Course? | Horizontally anterior; parallel and superior to buccinator
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| Risorius: Insertion? | Skin and mucosa at corners of the mouth
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| Risorius: Function? | Assists in drawing corners of mouth laterally
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| Transverse Muscles of Facial Expression? | Buccinator and Risorius
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| Angular Muscles of Facial Expression? | Zygomatic Major,
Levator Labii Superior, and
Depressor Labii Inferior
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| Zygomatic Major: Origin? | Surface of zygomatic bone
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| Zygomatic Major: Course? | Inferior and medial
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| Zygomatic Major: Insertion? | Orbicularis oris and skin at corner of mouth
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| Zygomatic Major: Function? | Draws corners of mouth superiorly and laterally (for broad smile)
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| Levator Labii Superior: Origin/Course? | Origin: Lower margin of orbit/inferiorly
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| Levator Labii Superior: Insertion? | Upper lip lateral to levator anguli oris
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| Levator Labii Superior: Function? | proper elevator for upper lip
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| Depressor Labii Inferior: Origin/Course? | Mandible; just lateral to midline/superiorly and medially
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| Depressor Labii Inferior: Insertion: | Insertion: Lower lip
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| Depressor Labii Inferior: Function? | Draws lower lip down and lateral
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| Vertical Muscles of Facial Expression? | Levator Anguli Oris,
Depressor Anguli Oris, and Mentalis
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| Levator Anguli Oris: Origin? | Origin: Lateral to nasal ala (side of nare)
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| Levator Anguli Oris: Course/Insertion? | Course: Inferior/Insertion: Orbicularis oris with some fibers crossing to lower lip
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| Levator Anguli Oris: Function? | Draws corners of mouth superiorly and aids in closing lower lip
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| Depressor Anguli Oris: Origin/Course? | Origin: Mandible; just lateral to midline/Course: superior
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| Depressor Anguli Oris: Insertion? | Insertion: orbicularis oris with some fibers crossing to upper lip
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| Depressor Anguli Oris: Function? | Depresses angle of lip and draws upper lip down
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| Mentalis: Origin/course? | Origin: Mental tuberosity of the mandible/Course: superiorly
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| Mentalis: Insertion? | Some fibers insert into chin and some into orbicularis oris
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| Mentalis: Function? | Everts lower lip, wrinkles chin, stiffens lower lip so mouth can be closed in a straight line
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| What action is Depressor Anguli Oris responsible for? | This muscle is responsible for frowning.
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| What action is Menatlis responsible for? | This muscle is responsible for pouting.
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| As a group, what action are the Vertical Muscles responsible for? | This group of muscles is responsible for smiling and frowning.
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| As a group, what action are the Transverse Muscles responsible for? | This group of muscles is responsible for pulling the lips laterally.
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