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.
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)
The masseter muscle inserts onto the masseteric tuberosity of the mandible.
Contractions of the masseter muscles elevate the mandible.
The masseter is innervated by the masseteric nerve, a branch of the mandibular division of the trigeminal nerve (CN V3).