Which muscle is responsible for the movement of the eyebrows?

The frontalis muscle is primarily responsible for the movement of the eyebrows. It is located at the forehead and is involved in raising the eyebrows, which can express surprise or concern. When the frontalis contracts, it pulls the skin of the forehead, which raises the eyebrows and wrinkles the forehead.

Understanding the role of the frontalis muscle in facial expression is important, especially in the context of cosmetology, where knowledge of muscular structure can affect aesthetic procedures and recommendations for clients. This muscle's action contributes to the overall appearance of the face, impacting not only how someone expresses emotions but also how they might look during cosmetic treatments.

The other muscles mentioned do serve important functions in facial movement but do not specifically raise the eyebrows like the frontalis does. The orbicularis oculi muscle is involved in closing the eyelids, the zygomaticus major helps with smiling by elevating the corners of the mouth, and the platysma contributes to the movement of the jaw and neck rather than directly affecting the eyebrows.