Levator labii superioris is a facial muscle that elevates the upper lip. There are several synonyms for this muscle, including the levator labii superioris alaeque nasi, levator labii superioris alaeque nasalis, and zygomaticus minor. These synonyms describe other functions of the muscle, such as its ability to raise the wing of the nose and pull the upper lip to the side. The levator labii superioris is an important muscle for many facial expressions, including smiling, snarling, and sneering. Understanding the various synonyms and functions of this muscle can help medical professionals treat facial disorders and help individuals improve their facial expressions.