Female Labial Commissure, Anterior View

Description

Centered on the oral fissure, the female labial commissure marks the lateral junction of the upper lip (labium superius) and lower lip (labium inferius), where the vermilion border turns into the cutaneous lip and the nasolabial and labiomental contours converge. Immediately lateral to the corner of the mouth sits the modiolus, a fibromuscular node that blends fibers of orbicularis oris with buccinator, zygomaticus major, risorius, levator anguli oris, and depressor anguli oris. From an anterior perspective, the commissure lies inferior to the alar base and lateral to the philtral columns, while the red lip (pars vermilionis) frames the oral vestibule medially. Clinically, this small region carries disproportionate diagnostic and procedural weight. Angular cheilitis commonly begins at the commissure, often driven by saliva pooling, Candida or Staphylococcus colonization, ill-fitting dentures, or iron and B vitamin deficiency, and the appearance differs from herpes labialis, which favors the vermilion border and perioral skin in clustered vesicles. The same landmarks guide cleft lip repair planning and revision, where millimeters at the commissure influence oral competence, symmetry, and the direction of the smile, and they also orient safe placement of dermal fillers or botulinum toxin near the modiolus to avoid contour distortion and drooling. Small anatomy. Big consequences. Use this artwork in head and neck anatomy courses, dental and orthodontic teaching files, plastic surgery or dermatology atlases, and patient-facing consent materials for perioral procedures or cheilitis management. It also fits well in speech-language pathology resources discussing orbicularis oris function and facial nerve palsy patterns around the mouth. Anatomical accuracy verified by SciePro's Medical Advisory Board.