Which muscle is primarily responsible for moving the scalp and raising eyebrows?

The frontalis muscle is primarily responsible for moving the scalp and raising the eyebrows. This muscle is located on the forehead and is a part of the occipitofrontalis muscle, which extends from the forehead to the back of the head. When the frontalis contracts, it pulls the skin of the forehead upward, which can create expressions such as surprise or curiosity, as well as raise the eyebrows.

In contrast, the zygomaticus muscle is primarily involved in smiling and helps elevate the corners of the mouth. The temporalis muscle is one of the muscles specifically involved in chewing, aiding in the elevation and retraction of the mandible. The masseter muscle is another key muscle of mastication that enables closed mouth chewing. Each of these muscles serves distinct functions related to facial expressions or jaw movement, but it is the frontalis that plays the crucial role in moving the scalp and raising the eyebrows.