Which muscle is responsible for creating creases between the eyebrows?

The muscle responsible for creating creases between the eyebrows is the corrugator supercilii. This small, thin muscle is located near the brow and plays a crucial role in facial expression. When it contracts, it pulls the eyebrows downward and together, which results in vertical furrows or creases between the eyebrows. This action is often associated with frowning or showing concern.

In contrast, the frontalis muscle primarily elevates the eyebrows and creates horizontal wrinkles across the forehead rather than between the brows. The orbicularis oculi encircles the eye and is involved in actions such as blinking and closing the eyelids but does not specifically create creases between the eyebrows. The zygomaticus major is involved in smiling and elevating the corners of the mouth, having no direct role in the furrowing of the brow area. Thus, the corrugator supercilii is specifically responsible for the unique action of creating those characteristic creases between the eyebrows.