HOSA Dental Terminology Practice

What is the main function of the mentalis muscle?

1. To contract the jaw

2. To move the chin tissue and raise the lower lip

3. To control tongue movements

4. To assist with chewing

The correct answer is: To move the chin tissue and raise the lower lip

The main function of the mentalis muscle is to move the chin tissue and raise the lower lip. This muscle is located at the tip of the chin and plays a vital role in facial expressions, particularly in expressing doubt or disdain. When the mentalis muscle contracts, it elevates the skin of the chin, resulting in the lip's elevation, which helps form various facial expressions. It is particularly important for actions like pouting or expressing emotions related to the mouth area. Other functions mentioned, such as contracting the jaw, controlling tongue movements, and assisting with chewing, are primarily associated with different muscles in the oral and facial regions. The masseter and temporalis muscles are responsible for jaw movements, while several intrinsic and extrinsic muscles manage tongue function. The role of the mentalis muscle is distinctly focused on the movement of the lower lip and chin, distinguishing it from the other choices.