Temporalis muscle

The temporalis muscle is one of the muscles of mastication. It is responsible for both closing the mouth and retraction (posterior fibres).

Summary

  • origin: temporal fossa between the infratemporal crest and inferior temporal line
  • insertion: coronoid process and ramus of mandible
  • innervation: temporal branches of mandibular 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 fibres 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

arterial supply: deep temporal branches of the maxillary artery, contributions from the middle temporal artery

Innervation

The muscle is supplied by the deep temporal branches of the anterior trunk of the mandibular nerve. It may also receive branches from the middle temporal nerve.

Action

  • upper and anterior fibres: close the jaws
  • posterior fibres: retract the mandible
  • side-to-side movements of the mandible

Head and neck anatomy
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Article Information

rID: 5459
Section: Anatomy
Synonyms or Alternate Spellings:
  • Temporalis muscles

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    Figure 1: diagram
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    Figure 2: muscles of mastication
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    Figure 3: MRI
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