Superior Lip Levator Muscle, Lateral View

Description

Running along the anterior midface, the levator labii superioris is shown in lateral profile from its bony origin at the inferior orbital margin of the maxilla and adjacent zygomatic region, descending toward the upper lip. Superiorly it lies inferior to the orbit and lateral to the nose, while its fibers pass superficial to the maxilla to blend with the orbicularis oris and the dermis of the upper lip. Medially, its course approaches the nasolabial fold; laterally, it neighbors the zygomaticus minor and major in the cheek. Facial expression depends on small, layered muscles with overlapping insertions, and a lateral view clarifies why selective weakness can look subtle. Denervation of the levator labii superioris in facial nerve palsy contributes to upper lip droop and reduced tooth show on attempted smile, and it helps explain asymmetry after trauma or iatrogenic injury along the zygomatic and infraorbital region. Injectable neurotoxin placement for gummy smile correction and upper lip hyperactivity also hinges on respecting the muscle’s vertical vector and its relationship to the infraorbital foramen and vessels. Plastic and reconstructive surgery texts often need this specific orientation when describing perioral rejuvenation, cleft lip repair planning, or nasolabial fold dynamics, where readers must visualize how elevators interdigitate with orbicularis oris. Dental anatomy and head and neck courses can pair the illustration with surface landmarks to teach expression muscles and their nerve supply. Anatomical accuracy verified by SciePro's Medical Advisory Board.