Temporalis muscle

Temporalis muscle

Muscle infobox
Name = Temporalis muscle
Latin = musculus temporalis
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Caption = The Temporalis; the zygomatic arch and Masseter have been removed.
Origin = temporal lines on the parietal bone of the skull.
Insertion = coronoid process of the mandible.
Blood = deep temporal
Nerve = third branch (mandibular nerve) of the trigeminal nerve
Action = elevation and retraction of mandible
Antagonist = Platysma muscle
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DorlandsPre = m_22
DorlandsSuf = 12551069
The temporalis muscle is one of the muscles of mastication.

tructure

It arises from the temporal fossa and the deep part of temporal fascia. It passes medial to the zygomatic arch and inserts onto the coronoid process of the mandible.

The temporalis muscle is covered by the temporal fascia, also known as the temporal aponeurosis.

The muscle is accessible on the temples, and can be seen and felt contracting while the jaw is clenching and unclenching.

Innervation

As with the other muscles of mastication, control of the temporalis muscle comes from the third (mandibular) branch of the trigeminal nerve. Specifically, the temporalis is innervated by the deep temporal nerves.

Actions

Contraction of the temporalis muscle elevates the mandible. The somewhat horizontal fibers of the posterior part of the muscle retract the mandible. In the human, the temporalis is the most powerful muscle of the body, with a record bite of 990 pounds observed in a man who suffered an epileptic seizure, which caused him to bite uncontrollably. This shattered most of his teeth. Were the teeth of a human able to withstand the sufficient pressure, a human could bite a hole into an automobile tire inflated to 65 psi, chew up a cinder block, or bite through the rings or chain of a pair of handcuffs.


=Additional

External links

*
* - "Infratemporal Fossa: The Temporalis Muscle"


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Look at other dictionaries:

  • temporalis muscle — noun muscle extending from the temporal fossa to the coronoid process of the mandible; acts to raise the mandible and close the jaws • Syn: ↑temporal muscle, ↑temporalis, ↑musculus temporalis • Hypernyms: ↑skeletal muscle, ↑striated muscle …   Useful english dictionary

  • temporalis — noun muscle extending from the temporal fossa to the coronoid process of the mandible; acts to raise the mandible and close the jaws • Syn: ↑temporalis muscle, ↑temporal muscle, ↑musculus temporalis • Hypernyms: ↑skeletal muscle, ↑striated muscle …   Useful english dictionary

  • temporalis — SYN: t. (muscle). [L.] * * * tem·po·ral·is .tem pə rā .ləs n a large muscle in the temporal fossa that serves to raise the lower jaw and is composed of fibers that arise from the surface of the temporal fossa and converge to an aponeurosis which… …   Medical dictionary

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Muscle — For other uses of Muscle , see Muscle (disambiguation). A top down view of skeletal muscle Muscle (from Latin …   Wikipedia

  • Temporalis — Musculus temporalis Ursprung Fossa temporalis (Schläfe) Ansatz Processus coronoideus des Unterkieferknochens …   Deutsch Wikipedia

  • muscle — muscleless, adj. muscly, adj. /mus euhl/, n., v., muscled, muscling, adj. n. 1. a tissue composed of cells or fibers, the contraction of which produces movement in the body. 2. an organ, composed of muscle tissue, that contracts to produce a… …   Universalium

  • temporalis — n. a fan shaped muscle situated at the side of the head, extending from the temporal fossa to the mandible. This muscle lifts the lower jaw, thus closing the mouth …   The new mediacal dictionary

  • temporalis — [ˌtɛmpə reɪlɪs] noun Anatomy a fan shaped muscle which runs from the side of the skull to the back of the lower jaw. Origin C17: from late L …   English new terms dictionary

  • skeletal muscle — noun a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes • Syn: ↑striated muscle • Hypernyms: ↑muscle, ↑musculus • Hyponyms: ↑voluntary muscle, ↑ …   Useful english dictionary

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