Masseter

The masseter (Latin: musculus masseter) is a thick and quadrangular-shaped paired masticatory muscle that elevates the lower jaw. The masseter is classified as the primary muscle of mastication.

Masseter muscle, Masseter, Muscles of mastication, Masticatory muscles, Head muscles
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Masseter
OriginZygomatic arch
InsertionMasseteric tuberosity of mandible
ActionElevates mandible
Innervation Masseteric nerve of mandibular nerve (CN V3)
Blood supply Masseteric artery of maxillary artery

The thickness of the masseter muscle is approximately 15 millimeters. It negatively correlates with the mandibular plane angle and positively with the height of the mandibular ramus and thickness of the alveolar process. Therefore, the masticatory function influences the morphology of the mandible.1 (Kubota et al. 1998)

 

Origin

The masseter muscle originates from the zygomatic arch that is formed by the zygomatic process of the temporal bone and temporal process of the zygomatic bone.

 

Insertion

The masseter inserts on the masseteric tuberosity of the mandible.

Origin and insertion of masseter muscle, Masseter muscle
Origin and insertion of masseter by Anatomy Next

 

Action

Contractions of the masseter muscle elevate the mandible.

Action of masseter, Function of masseter, Masseter, Relaxed masseter, Contracted masseter
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Innervation

The masseter muscle is innervated by the masseteric nerve, a branch of the mandibular division of the trigeminal nerve (CN V3).

 

Blood supply

The masseter is supplied with the arterial blood by the masseteric artery of the maxillary artery.