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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.
| Levator labii superioris alaeque nasi | |
| Origin | Frontal process of maxilla |
| Insertion | Skin of ala of nose and upper lip |
| Action | Dilates nostril Elevates ala of nose and upper lip |
| Innervation | Zygomatic branch of facial nerve (CN VII) |
| Blood supply | Facial artery, infraorbital artery of maxillary artery |
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.
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