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Masseter

The masseter (also masseter muscle, latin: musculus masseter) is a masticatory muscle that elevates the lower jaw and originates from zygomatic arch and inserts into the masseteric tuberosity of the mandible. The masseter muscle is thick and quadrangular in shape. 

Masseter muscle
Masseter by Anatomy Next

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

Origin

The masseter originates from the zygomatic arch formed by the zygomatic process of the temporal bone and frontal process of the zygomatic bone.

Insertion

The masseter muscle inserts onto the masseteric tuberosity of the mandible

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

Action

Contractions of the masseter muscles elevate the mandible.

Action of masseter by Anatomy Next

Innervation

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