Labial Commissure, Anterior View

Description

Centered on the male oral aperture, the labial commissure is shown as the lateral junction where the upper and lower lips meet in the anterior view. Orbicularis oris fibers converge at the mouth corner and blend with the adjacent perioral musculature, with the vermilion border continuing medially onto each lip and the cutaneous lip positioned superior and inferior to it. Lateral to the commissure, the cheek soft tissues form the oral angle region, where muscle slips from risorius and zygomaticus major typically interdigitate with the modiolus. Small structure, big consequences. Attention to the labial commissure matters because it is a key landmark in facial nerve testing and perioral reconstruction. Weakness of the buccal and marginal mandibular branches of the facial nerve can present as drooping or poor oral competence at the mouth corner, while surgical repair after laceration must respect the modiolus to avoid postoperative asymmetry and sialorrhea. For cleft lip revisions, oral commissuroplasty, and trauma closure, this anterior perspective helps plan skin and mucosal alignment along the vermilion-cutaneous junction. Use this artwork in head and neck anatomy teaching on perioral muscles, in plastic and reconstructive surgery texts discussing oral commissure repair, and in emergency medicine training modules on layered closure of mouth-corner lacerations. It also supports patient-facing education on facial palsy patterns when paired with facial nerve diagrams. Anatomical accuracy verified by SciePro's Medical Advisory Board.