temporalis muscle
The temporalis muscle is one of the muscles of mastication. It is responsible for both closing the mouth and retraction (posterior fibers).
Summary
- origin: temporal fossa between the infratemporal crest and inferior temporal line on the parietal bone; deep surface of the temporalis fascia
- insertion: coronoid process and ramus of mandible
- innervation: deep temporal nerves, branches off the anterior division of the mandibular divison of the trigeminal nerve
- action: elevate and retract the mandible
Gross anatomy
Temporalis is a broad, radiating muscle, situated at the side of the head which arises from the whole of the temporal fossa (except that portion of it which is formed by the zygomatic bone) and from the deep surface of the temporal fascia. Its fibers converge as they descend, and end in a tendon, which passes deep to the zygomatic arch and is inserted into the medial surface, apex, and anterior border of the coronoid process of the mandible, and the anterior border of the ramus of the mandible nearly as far forward as the last molar tooth.
Blood supply
Deep temporal branches of the maxillary artery and contributions from the middle temporal artery.
Innervation
The muscle is supplied by the deep temporal nerves of the anterior division of the mandibular nerve. It may also receive branches from the middle temporal nerve.
Action
- upper and anterior fibers: close the jaws
- posterior fibers: retract the mandible
- side-to-side movements of the mandible
Siehe auch:
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Assoziationen und Differentialdiagnosen zu temporalis muscle:
