Insertion: Nostril and upper lip
Nerve: Buccal branch of the facial nerve
Action: Dilates the nostril; elevates the upper lip and wing of the nose
The levator labii superioris alaeque nasi muscle is attached to the upper frontal process of the maxilla and inserts into the skin of the lateral part of the nostril and upper lip. It has the longest name of any muscle in an animal.