Masseter muscle

Masseter
Muscles of the head and neck.
Dissection, showing salivary glands of right side. (Masseter visible at center.)
Details
Origin	zygomatic arch and maxilla
Insertion	coronoid process, ramus of mandible, cementomaxillary tendon and cementomandibular tendon
Artery	masseteric artery
Nerve	mandibular nerve (V3)
Actions	elevation (as in closing of the mouth) and protraction of mandible
Antagonist	Platysma muscle
Identifiers
Latin	musculus masseter
MeSH	D008406
TA98	A04.1.04.002
TA2	2105
FMA	48996
Anatomical terms of muscle

In human anatomy, the masseter is one of the muscles of mastication.

In the animal kingdom, it is particularly powerful in herbivores to facilitate chewing of plant matter.

Origin and insertion of the two heads

The masseter is a thick, somewhat quadrilateral muscle, consisting of two parts, superficial and deep. The fibers of the two portions are continuous at their insertion. The masseter muscle is sometimes the target of plastic jaw reduction surgery.

Superficial

The superficial portion, the larger, arises by a thick, tendinous aponeurosis from the zygomatic process of the maxilla, and from the anterior two-thirds of the lower border of the zygomatic arch. Its fibers pass downward and backward, to be inserted into the angle and lower half of the lateral surface of the ramus of the mandible.jkhafdiugREGIIORHGIJKHGFDAHGFDAIOREAIKHFDLHFIU RI TYOSAR;TLKHY;OTAKHOTHBKFDHGIKJARHDTGOIAUREOITUQOREIUTREJUFBIFDSHJBGIORTWUYPO IUWRTIOYSTFGIH;SAIORDUTTUYHGOJTHYEOIYH REJYKAREFUGRTEILUYRTW RTE RTGEIUY45G3HIOBY5RTEWIUOBYRTEILU GFD TESW 4WIOY4RTWJKHAREDG AUREHGTWUERHYTISFDVJKB RITURTYEW GURHGVHYREIUTYEIRHFG IUREAY4RFJHDSGIURYEUGHAJFDHGKSJHFGSRHDFGRYTIUY7ERYURYETIURTEHGIJHRFIUGWOEI85UTKJAFDHG98W45TUJFDHIUODATIOEARIFUGYDSRTYWRETHGLBVIUFGIOU YRDSPTGYFDIOUGYIJUDSGFUYJHGFDSJKLUGRGEAIYRGKUHRGEEJKUGFDAVFDIOHFDABGJVGC JHDSGFJLYA TDR8FG BJHGIRDFGKQRHE BVYGURDFBCYG CBEURYTFCGKDSF YDSGREIGSDFC SUYDTYQWFVNBDS YEWRTHSDbvcvjresah

Innervation

Along with the other three muscles of mastication (temporalis, medial pterygoid and lateral pterygoid), the masseter is innervated by the mandibular division of the trigeminal nerve.

Additional images

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  Masseter muscle
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  Masseter muscle
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  Masseter muscle
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  Left temporal bone. Outer surface.
• 
  Left temporal bone. Inferior surface.
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  Left zygomatic bone. Temporal surface.
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  Mandible. Outer surface. Side view.
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  Base of skull. Inferior surface.
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  The arteries of the face and scalp.
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  Veins of the head and neck.
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  Mandibular division of the trifacial nerve.
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  Muscles of the head, face, and neck.

See also

• Zygomasseteric system

External links

• Template:MuscleLoyola
• . GPnotebook https://www.gpnotebook.co.uk/simplepage.cfm?ID=-100270003. {{cite web}}: Missing or empty |title= (help)
• Template:EMedicineDictionary