Muscular Anatomy The temporalis originates along the temporal line of the parietal and frontal bones and travels medially to the zygomatic arch to insert on the coronoid process of the mandible. It also has attachments to the zygoma. The masseter originates on the inferior aspect of the zygoma and zygomatic arch and inserts on the angle of the mandible. The zygomaticus major and minor are muscles of facial expression that originate on the zygoma and insert near the corner of the mouth to assist with commissure elevation. Other landmarks Tubercle of Whitnall: The attachment site of the lateral canthal tendon located on the medial surface of the frontal process of the zygoma.