Mentolabial Sulcus on the Male Head

Description

Running transversely across the inferior oral region, the mentolabial sulcus forms a shallow groove separating the lower lip (labium inferius) from the prominence of the chin (mentum). Medially, the furrow lies just inferior to the lower lip vermilion and superior to the soft tissue pogonion, then extends laterally toward the oral commissures where it blends with the perioral creases. Beneath the skin, the sulcus corresponds to the interface between the orbicularis oris superiorly and the mentalis muscle inferiorly, with sublabial soft tissue fullness sitting immediately above the mental eminence. A key surface landmark. For facial analysis, this crease marks the lower third aesthetic unit and helps define the labiomental angle used in orthodontic planning, genioplasty, and chin implant selection. Mentalis hyperactivity, lower incisor decompensation, or postsurgical scarring can deepen the mentolabial groove and produce a chin dimple appearance, while edema or filler placement can blunt it and alter lip competence. Surgeons also reference this sulcus when designing sublabial incisions and when orienting dissection planes to avoid distortion of the lower lip and chin contour. Use this artwork in head and neck anatomy teaching, surface anatomy labs, and clinical communication around cosmetic and reconstructive procedures of the chin and lower lip in adult males. It also fits well in orthodontic, maxillofacial, plastic surgery, and dermatology publications that need a clean depiction of the mentolabial sulcus as a named facial landmark. Anatomical accuracy verified by SciePro's Medical Advisory Board.