Superior Lip Levator Under the Skin, Gross Anatomy

Description

Seen in lateral profile beneath the facial skin, the levator labii superioris alaeque nasi is highlighted along the lateral nose and upper lip, arising superiorly from the frontal process of the maxilla adjacent to the medial orbital margin. Its fibers descend inferiorly and slightly anteriorly beside the nasal bone and upper lateral cartilages, then split to insert into the alar cartilage and the skin and muscle of the upper lip, blending with levator labii superioris and orbicularis oris near the nasolabial fold. Posterior to this region, the zygomatic bone and maxilla frame the midface, while the mandible, dentition, and a segment of the cervical vertebrae provide bony context. Functionally, this small slip matters because it couples elevation of the upper lip with dilation of the nostril, a combination that becomes obvious in facial expression analysis and in reconstructive planning. Surgical approaches around the medial canthus, lateral nasal wall, and upper lip (including cleft lip revision and alar base modification) must respect the muscle’s course to avoid postoperative asymmetry of the philtrum and alar flare. Short muscle. Big cosmetic consequences. Educators can drop this plate directly into head and neck gross anatomy teaching to clarify the layered relationships of the maxilla, nasal aperture, and perioral musculature, and it also supports chapters on facial expression muscles, rhinoplasty landmarks, and perioral reconstruction in surgical atlases. Clinicians may find it useful for preoperative counseling visuals when discussing upper lip lift vectors and anticipated changes at the alar rim. Anatomical accuracy verified by SciePro's Medical Advisory Board.