Which muscle is known as the frontalis?

The frontalis is a muscle located in the forehead region that plays a key role in facial expressions. It is responsible for raising the eyebrows and wrinkling the forehead. This action is essential for nonverbal communication, allowing individuals to convey emotions such as surprise or concern. The frontalis is also part of the larger occipitofrontalis muscle group, which includes the occipitalis at the back of the head.

In contrast, the masseter is the primary muscle used for chewing, crucial for the process of mastication. The orbicularis oris encircles the mouth and is involved in actions like puckering the lips or closing the mouth. The zygomaticus minor assists in smiling by elevating the upper lip. Each of these muscles has its specific functions and areas of movement, but the frontalis distinctly contributes to expressions involving the forehead and eyebrows.