The Masseter is a quadrangular muscle covering the lateral aspect of the ramus and the coronoid process of the mandible. It originates from the anterior two thirds of the zygomatic arch and the zygomatic process of the maxilla, and inserts on the lateral surface of the angle and lower ramus of the mandible. It elevates the mandible, enabling forced closure of the mouth during mastication. The anterior division of the mandibular nerve (V) innervates the masseter.