The Levator anguli oris muscle is a facial muscle located in the upper lip and corner of the mouth. It extends from the upper jawbone to the corner of the mouth and is responsible for elevating the angle of the mouth, creating a variety of facial expressions.

The Levator anguli oris muscle is involved in several facial expressions, including smiling, laughing, and expressing happiness. It also plays a role in regulating the position and movement of the angle of the mouth during speech and eating.

The importance of the Levator anguli oris muscle lies in its contribution to proper facial expression and communication. By controlling the position and movement of the angle of the mouth, it can help to convey various emotions and facilitate effective communication. It also plays a role in proper oral function, particularly in helping to regulate the movement of food and drink during eating and drinking.

Dysfunction of the Levator anguli oris muscle can lead to various issues, including difficulty speaking and eating, as well as difficulty conveying certain emotions through facial expressions. It can also contribute to sagging skin in the corner of the mouth and the development of wrinkles around the mouth.