Which muscle is responsible for raising the eyebrows and causing forehead wrinkles?

The muscle responsible for raising the eyebrows and causing forehead wrinkles is the frontalis. This muscle is located in the forehead and is part of the occipitofrontalis muscle group. When the frontalis contracts, it pulls the skin above the eyebrows upward, resulting in the elevation of the eyebrows. This action can create prominent horizontal wrinkles across the forehead, especially when expressing surprise or concern.

The frontalis is essential in making various facial expressions, and its contraction is typically associated with actions that convey emotions, such as raising the eyebrows in disbelief or excitement. Understanding the role of the frontalis in facial dynamics helps in both esthetic practices and the analysis of facial expressions.