Levator Anguli Oris Muscle, Anterior View

Description

Arising from the canine fossa of the maxilla just inferior to the infraorbital foramen, the levator anguli oris (caninus) runs inferiorly and laterally to blend into the modiolus at the oral commissure. From an anterior facial perspective, it sits deep to the zygomaticus major and zygomaticus minor and lateral to the levator labii superioris, forming a vertical pillar that supports the corner of the mouth. Surrounding muscles visible in this frontal dissection-style rendering include the frontalis superiorly, orbicularis oculi around the palpebral fissure, nasalis over the nasal cartilages, and orbicularis oris encircling the oral aperture. Masseter bulk at the mandibular ramus provides lateral context. Accurate identification of levator anguli oris matters when you are teaching how the modiolus integrates multiple mimetic muscles into a functional hub, because small differences in fiber direction explain why “smile elevators” do not all act the same. Weakness from a buccal branch facial nerve lesion can flatten elevation at the oral commissure even when orbicularis oris remains active, while hyperactivity is sometimes targeted in chemodenervation for asymmetric smile or perioral dystonia. Surgeons planning perioral flaps and clinicians interpreting midface injection planes also track its relationship to the maxilla and neighboring elevators. Small muscle, big consequences. Use this illustration in head and neck anatomy labs, facial expression modules in dental and medical curricula, and surgical education materials discussing the modiolus, oral commissure reconstruction, and facial nerve branch deficits. It also fits neatly into patient-facing counseling graphics for facial reanimation or botulinum toxin planning when you need a clean anterior view with a single muscle emphasized. Anatomical accuracy verified by SciePro's Medical Advisory Board.