The temporalis (also temporalis muscle, temporal muscle, latin: musculus temporalis) is one of the main muscles of mastication, which is involved in the elevation and retraction of the lower jaw.
The temporal muscle is a wide, fan-shaped muscle on each side of the head that covers most of the temporal bone and fills the temporal fossa. The temporalis is covered by the temporal fascia.
The temporalis originates from the temporal plane on the side of the cranium, passes the zygomatic muscle medially and forms a tendon that inserts onto the coronoid process of the mandible.
Upon activation the temporalis muscle elevates the mandible. The temporalis also retracts the mandible, pulling it backwards with the posterior fibers of the muscle.
The temporalis is innervated by the deep temporal nerve, a branch of the mandibular division of the trigeminal nerve (CN V3).