The temporalis muscle is a broad, fan-shaped muscle located on the side of the head that helps with chewing and jaw movement. There are several synonyms for the temporalis muscle, including the temporal muscle, temporalis fascia, temporalis tendon, and temporalis aponeurosis. The temporalis muscle is also known as the temporalis region, the temporal fossa, and the temporal fossa muscle. Additionally, it is sometimes referred to as the temporalis head, as it has attachments to the skull at the temporal bone. No matter what term is used to describe it, the temporalis muscle plays a vital role in the function and movement of the jaw.