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The masseter muscle (Latin: musculus masseter) is a powerful masticatory muscle of the manducatory apparatus. It is made up of two parts : a superficial part, a deep part formed They are separated into four fascicles: a superficial, an intermediate, a deep and a coronoid[1],[2] . Origin The superficial fascicle inserts on the anterior 2/3 of the zygomatic arch, including an insertion on the posteroinferior edge of the zygomatic bone, via an aponeurotic blade joining the lateral surface of the muscle; The intermediate fasciculus inserts slightly more posteriorly to the superficial fasciculus; The deep fasciculus arises on the lower edge of the zygomatic arch, including the zygomatic process of the temporal bone; The coronoid fasciculus inserts on the medial surface of the zygomatic process of the temporal bone. Trajectory The superficial fasciculus is oblique downwards and posteriorly; The intermediate fasciculus is slightly more vertical. It is almost completely covered by the superficial bundle; The deep bundle is vertical and descending; The coronoid bundle is oblique. Insertion The masseter ends on the lateral surface of the mandible: The superficial fasciculus terminates on the lower part of the ascending ramus of the mandible, covering the gonion (angle of the mandible); The deep fasciculus terminates on the lateral surface of the ascending ramus of the mandible, above the superficial fasciculus, going up to the front of the mandible. Translated with DeepL.com (free version)

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