Orbicularis oris

Definition

The orbicularis oris is a complex of muscles in the lips that encircles the mouth. It is responsible for controlling movements such as puckering and closing the lips.

Related terms

Facial Muscles: These are muscles in the face that control expressions, including smiling, frowning, and other movements.

Buccinator Muscle: A muscle of facial expression that lies deep to the cheeks; it helps in chewing by pushing food onto the grinding surfaces of the teeth.

Zygomaticus Major:

A muscle of facial expression that elevates the corners of the mouth upward, mainly responsible for creating a smile