The temporalis is a broad, fan-shaped muscle located on the side of the head. It plays a crucial role in the movement of the jaw, specifically in the process of chewing. This muscle originates from the temporal fossa of the skull and inserts into the coronoid process of the mandible, allowing for powerful elevation and retraction of the jaw. In addition to its primary function in mastication, the temporalis is also involved in the overall function of the temporomandibular joint (TMJ). Proper functioning of this muscle is essential for maintaining jaw stability and facilitating smooth movements during activities like speaking and eating.