Corpus: Levator labii superioris alaeque nasi muscle

The levator labii superioris alaeque nasi muscle is a superficial muscle located in the anterior cheek area, or along the nasal slope, that lifts both.

The nomenclature of the facial muscles is not standardized in anatomical literature. The levator labii superioris alaeque nasi muscle is sometimes referred to as the angular head of the levator labii superioris muscle.

Note: This muscle has the longest name of all human muscles. Its name literally translates to "lifting muscle of the upper lip and nostril," or "upper lip and nostril lifter."

The levator labii superioris alaeque nasi muscle originates from the lower edge of the eye socket (orbit) and the frontal aspect of the upper jawbone (maxilla). Its fibers run downward along the nasal slope to insert into the upper lip and nostril. Some fibers also integrate with the orbicularis oris muscle.

The levator labii superioris alaeque nasi muscle is innervated by the buccal branches of the facial nerve (cranial nerve VII).

This muscle pulls the upper lip upward, exposing the upper incisors, and also lifts the corresponding nostril. Contraction of the muscle is associated with expressions of disgust or contempt. The muscle is fused with the underlying skin, leading to the formation of the nasolabial fold during contraction.