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masticatory muscle of posterior cheek; origin, superficial part: inferior border of the anterior two thirds of the zygomatic arch; deep part: inferior border and medial surface of the zygomatic arch; insertion, lateral surface of ramus and coronoid process of the mandible; action, elevates mandible (closes jaw); nerve supply, masseteric branch of mandibular division of trigeminal.
Synonym(s): musculus masseter [TA]
masseter/mas·se·ter/ (mas-ēt´er) masseter muscle. masseter´ic
A thick muscle in the cheek that closes the jaws during chewing.
mas′se·ter′ic (măs′ĭ-tĕr′ĭk) adj.
Etymology: Gk, one who chews
the thick rectangular muscle in the cheek that functions to close the jaw. It is one of the four muscles of mastication. The masseter is innervated by the masseteric nerve from the mandibular division of the trigeminal nerve.
masseterThe major jaw muscle, which participates in protraction, retraction and side to side movement of the jaw.
Mandibular branch of trigeminal.
Origin, superficial part
Zygomatic process of maxilla, inferior border of zygomatic arch.
Origin, deep part
Inferior border and medial suface of zygomatic arch.
Insertion, superficial part
Angle, ramus of mandible.
Insertion, deep part
Superior ramus, lateral coronoid process of mandible.
masseterA short, thick, paired muscle in each cheek running down from the cheekbone (zygomatic arch) to the outer corner of the jawbone (mandible). The masseters act to raise the lower jaw and compress the teeth together in the act of chewing.
masseterthe chewing muscle which raises the lower jaw.
see masseter muscle and Table 13.1H.