Which muscle aids in raising the eyebrows?

The muscle that aids in raising the eyebrows is the frontalis. This muscle is part of the occipitofrontalis muscle group and is located in the forehead area. When the frontalis contracts, it pulls the skin of the forehead up, resulting in the eyebrows being raised and the skin on the forehead becoming wrinkled. This action is commonly associated with expressions of surprise or curiosity.

In contrast, the other muscles listed do not perform this action. The occipitalis is involved in pulling the scalp backward rather than raising the eyebrows. The zygomaticus major is primarily responsible for smiling, as it elevates the corners of the mouth. The sartorius, located in the thigh, is involved in flexing the hip and knee and has no role in facial expressions or eyebrow movement. Understanding the specific functions of each muscle helps in recognizing the unique contributions they make to facial expressions and movements.