Levator labii superioris alaeque nasi

The levator labii superioris alaeque nasi (Latin: musculus levator labii superioris alaeque nasi) is a muscle of facial expression that widens the nostril and elevates the upper lip, thus enabling the facial expression of snarling. It is classified as the nasal facial muscle.

Origin

The levator labii superioris alaeque nasi muscle originates from the frontal process of the maxilla.

Insertion

The levator labii superioris alaeque nasi inserts into the skin of the ala of the nose and upper lip.

Action

Contractions of the levator labii superioris alaeque nasi dilate the nostril and elevate the wing of the nose and upper lip. This muscle is responsible for the facial expression that accompanies snarling.

Innervation

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

Blood supply

Arterial blood is supplied to the levator labii superioris alaeque nasi via the facial artery and infraorbital branch of the maxillary artery.