Where does the mentalis muscle attach?

The mentalis muscle primarily attaches to the dermis of the skin, specifically at the chin area. Its origin is on the anterior surface of the mandible, just above the mental protuberance, but its action is more visibly noted in relation to the skin. The muscle is responsible for actions like elevating and protruding the lower lip, which creates a pout and wrinkles the skin of the chin. This relationship with the skin allows it to effectively contribute to facial expressions.

While the muscle originates from the mandible, the correct focus is on its attachment to the dermis, where it plays a crucial role in facial dynamics. This contrasts with the other options: the maxilla is not involved in its attachment points, and the oral mucosa does not serve as an attachment site for this muscle, although it may be in proximity to its functional area.