Levator Anguli Oris, Lateral View

Description

Running deep to the zygomaticus major and minor, the levator anguli oris arises from the canine fossa of the maxilla just inferior to the infraorbital foramen and courses inferolaterally toward the modiolus at the angle of the mouth. In this lateral male head view, the muscle’s fibers align anterior to the buccinator and blend with perioral musculature at the oral commissure, where it interdigitates with depressor anguli oris and orbicularis oris. Underlying bony landmarks logically include the maxilla and mandible, the zygomatic bone forming the lateral orbital rim, and the nasal aperture with adjacent nasal cartilages. Posteriorly, the lateral cranial vault and the cervical vertebrae (C1 to C7) provide skeletal context and orientation. Functionally, levator anguli oris elevates the mouth corner and stabilizes the modiolus during smiling, speech articulation, and bolus control. Small muscle, big teaching payoff. This view is also where clinical anatomy becomes concrete: injury to terminal branches of the facial nerve during cheek and perioral procedures, or scarring and malar incisions, can weaken oral commissure elevation and create asymmetry that is often misattributed to zygomaticus dysfunction alone. Surgeons planning cleft lip revision, facial reanimation, or oral commissuroplasty often treat the modiolus as a three-dimensional tendon, and seeing levator anguli oris in relation to the maxilla and buccinator helps explain why vectors of pull matter. Use this illustration for head and neck anatomy courses, facial expression musculature labs, and surgical atlases covering perioral approaches, facial nerve branches, and smile mechanics. It also fits well in patient-facing education for facial palsy, showing why a lateral cheek dissection targets more than just the zygomaticus. Anatomical accuracy verified by SciePro's Medical Advisory Board.