The levator labii superioris (or quadratus labii superioris) is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone.
The levator labii superioris (or quadratus labii superioris) is a muscle of the human body used in facial expression. It is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone.