The levator anguli oris plays a key role in nonverbal communication, as it helps the face form one of the most universally known expressions: the smile. The muscle elevates the angles of the mouth at ...

The depressor anguli oris is a facial muscle that allows a person to move the corners of their mouth, specifically downward. The muscle sits on either side of the mouth. Frowning involves activating ...

The depressor anguli oris muscle is attached to the lower jaw (mandible). It ends at the orbicularis oris, which is the ring-like muscle that encompasses the lips. It is attached at the edge of the ...