Levator labii superioris
Musculus levator labii superioris
Also known as: quadratus labii superioris, levator labii superioris alaeque nasi
A flat muscle from the infraorbital margin to the upper lip. It elevates and everts the upper lip and deepens the nasolabial fold.
Overview
Levator labii superioris arises from the infraorbital margin of the maxilla, just above the infraorbital foramen, and descends into the upper lip. Medially, the separate levator labii superioris alaeque nasi also lifts the ala of the nose (a "sneer"). Together with zygomaticus minor, these muscles raise the upper lip to expose the upper teeth and shape the nasolabial fold. They cover the infraorbital neurovascular bundle.
Anatomy
- Origin
Infraorbital margin of the maxilla, above the infraorbital foramen.
- Insertion
Skin and muscle of the upper lip (blending with orbicularis oris).
- Action
Raises and everts the upper lip, exposing the maxillary teeth (sadness, disdain).
- Innervation
Facial nerve (CN VII), zygomatic and buccal branches.
- Nerve roots
Cranial nerve VII; no spinal roots
- Arterial supply
Facial artery (superior labial branch) and infraorbital artery.
- Relations
Lies over the infraorbital foramen and nerve (V2), which emerges deep to it.
Function
- Elevates and everts the upper lip
- Deepens the nasolabial fold
Compiled from standard anatomy and physiology references — see the Muscular System sources. For education only; not medical advice.