Anatomical Structure and Location of the Levator Anguli Oris

Description

Centered on the midface of an adult male, the levator anguli oris is isolated against the maxilla and perioral soft tissues, with the skull, dentition, and upper cervical spine rendered as contextual landmarks. Arising from the canine fossa of the maxilla inferior to the infraorbital margin and lateral to the piriform aperture, its fibers descend inferolaterally toward the modiolus at the angle of the mouth, where they blend with orbicularis oris and adjacent elevators. Superficial to its origin lie the facial soft tissues, while the muscle itself typically sits deep to zygomaticus major and near the lateral border of levator labii superioris as both converge on the upper lip and oral commissure. Teeth in the maxilla and mandible provide orientation for the alveolar processes and occlusal plane. Isolated depiction of levator anguli oris matters because small changes in its tone alter commissure position and the perceived symmetry of a smile, a common focus in facial palsy assessment and reconstructive planning. Injury to the buccal and zygomatic branches of the facial nerve (CN VII), whether from parotid surgery, midface laceration, or iatrogenic traction, can weaken this elevator and leave the mouth corner depressed at rest and on animation. For injectables, the muscle’s deep course near the modiolus helps explain why overcorrection or inaccurate depth can produce an unnatural, tight smile or impair oral competence. Small muscle, big effect. Use this artwork in gross anatomy and head and neck modules to teach layered facial expression musculature in relation to the maxilla, dentition, and the cervical spine’s midline reference. It also fits maxillofacial, ENT, and plastic surgery materials covering smile dynamics, facial nerve mapping, and perioral reconstruction, where clear spatial relationships around the oral commissure and canine fossa reduce ambiguity for learners and readers. Anatomical accuracy verified by SciePro's Medical Advisory Board.