What is the primary function of the Temporalis muscle?

The primary function of the Temporalis muscle is indeed to control the jaw motion while chewing. This muscle is a prominent and fan-shaped muscle located on the side of the head and plays a critical role in the process of mastication, which is the act of chewing food. When the Temporalis muscle contracts, it raises the mandible (lower jaw) and aids in closing the jaw, allowing for the crushing and grinding of food. This action is essential for effective chewing and digestion, making the Temporalis muscle vital for overall oral function.

The other functions mentioned in the choices relate to muscles involved in facial expressions and movements, rather than the mechanics of chewing. These muscles include those responsible for smiling or raising the corners of the mouth, which do not engage the Temporalis muscle. Thus, recognizing the specific role of the Temporalis in jaw motion helps differentiate its purpose from other facial muscles.