Levator Anguli Oris, Gross Anatomy

Description

Arising from the canine fossa of the anterior maxilla, the levator anguli oris ascends superiorly and slightly laterally to blend with the modiolus at the angle of the mouth, deep to the superficial mimetic muscles. In lateral perspective, its belly sits inferior to the infraorbital margin and adjacent to the maxillary sinus region, with the zygomaticus major and minor running more obliquely from the zygomatic bone toward the upper lip and oral commissure. Posteriorly, the buccinator forms the muscular wall of the cheek and meets the orbicularis oris at the modiolus, creating a crowded intersection of fibers where subtle changes in direction matter. Bony landmarks such as the maxilla, zygoma, mandible, and dentition frame the soft tissue attachments. Clinically, the levator anguli oris helps elevate the oral commissure, so its relationship to the modiolus is central when teaching perioral expression mechanics and when planning aesthetic or reconstructive work around the smile line. The infraorbital foramen lies superior and slightly lateral to its origin, a practical warning zone during maxillofacial approaches and local anesthetic blocks, and edema or scarring in the canine fossa can tether its function. Small muscle, big consequences. This plate fits facial anatomy and head and neck dissection teaching, where students need to sort the deeper elevator of the mouth angle from the more superficial zygomaticus muscles and from the buccinator in the cheek. It also supports surgical atlases and clinical education on cleft lip repair planning, oral commissure reconstruction, and safe injection technique in the midface. Anatomical accuracy verified by SciePro's Medical Advisory Board.