What is one of the primary actions of the temporalis muscle?

The temporalis muscle plays a significant role in the movement of the jaw, specifically in the elevation and retraction of the mandible. Its primary function is to elevate the mandible, which is essential for biting and chewing, as it raises the lower jaw to close the mouth. Additionally, the muscle helps to retract the mandible, moving it backward, which is important for positioning the jaw during various oral functions.

This dual action of elevation and retraction is crucial for effective chewing and speaking, making the temporalis one of the key muscles involved in jaw movement. Understanding the role of this muscle helps clarify its importance in dental and oral health, as dysfunction in the temporalis can lead to issues such as temporomandibular joint (TMJ) disorders, which can affect a person's ability to eat or speak comfortably.