Origin, insertion, and action.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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Frontalis | O- galea aponeurotica | I- skin of eyebrows and root of nose | With aponeurosis fixed, raises the eyebrows (as in surprise); wrinkles forehead skin horizontially.
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Occipitalis | O- occipital and temporal bones | I- galea aponeurotica | Fixes aponeurosis and pulls scalp posteriorly.
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Corrugator Supercilli | O- arch of frontal bone above nasal bone | I- skin of eyebrow | Draws eyebrows together and inferiorly; wrinkles skin of forehead vertically (as in frowning).
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Zygomatics- major and minor | O- zygomatic bone | I- skin and muscle at corner of mouth | Raises lateral corners of mouth upward (smiling muscle).
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Risorius | O- lateral fascia associated with masseter muscle | I- skin at angle of mouth | Draws corner of lip laterally; tenses lips; synergist of zygomaticus.
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Orbicularis Oris | O- arises indirectly from maxilla and mandible; fibers blended with fibers of other facial muscles associated with the lips | I- encircles mouth; inserts into muscle and skin at angles of mouth | Closes lips; purses and protudes lips; kissing and whistling muscle.
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Mentalis | O- mandible below incisors | I- skin of chin | Protrudes lower lip; wrinkles chin.
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Buccinator | O- molar region of maxilla and mandible | I- orbicularis oris | Draws corner of mouth laterally; compresses cheek (as in whistling and sucking); holds food between teeth during chewing; well developed in nursing infants.
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Platysma | O- fascia of chest (over pectoral muscles and deltoid) | I- lower margin of mandible, and skin and muscle at corner of mouth | Helps depress mandible; pulls lower lip back and down, i.e., produces downward sag of mouth; tenses skin of neck (e.g., during shaving).
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Masseter | O- zygomatic arch and maxilla | I- angle and ramus of mandible | Prime mover of jaw closure; elevates mandible.
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Temporalis | O- temporal fossa | I- coranoid process of mandible via a tendon that passes deep to zygomatic arch | Closes jaw; elevates and retracts mandible; synergist of pterygoids in side-to-side movements; maintains posistion of the mandible at rest.
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