Nasolabial Sulcus Viewed in Anterior Orientation

Description

Arising at the inferolateral margin of the ala nasi, the nasolabial sulcus runs obliquely inferiorly and laterally toward the oral commissure, marking the boundary between the cheek and the upper lip in anterior orientation. Medial to the fold lie the upper lip and philtral region, while lateral to it the buccal soft tissues round into the malar and paranasal cheek. Its superior end blends with the nasal sidewall, and its inferior extent approaches the modiolus where perioral muscles interlace. A clear surface landmark. Facial surgeons and injectors use this groove, also termed the melolabial fold, to judge midface volume and perioral dynamics, because the crease deepens when the levator labii superioris and zygomaticus complex elevate the upper lip during smiling. Age related descent of the malar fat pad and loss of maxillary support accentuate the sulcus, while overcorrection with dermal fillers can efface the fold and risk an unnatural upper lip cheek junction. The nearby course of the facial artery and vein as they traverse the nasolabial region makes precise surface mapping relevant to safe injection technique and planning of nasolabial flap design. Ideal for teaching surface anatomy of the anterior face in head and neck, dental, and aesthetics curricula, and for illustrating chapters on facial aging, rhytids, and perioral rejuvenation in plastic surgery or dermatology texts. Clinics can also pair it with patient education materials to localize “smile lines” and set expectations for filler, fat grafting, or surgical lift outcomes. Anatomical accuracy verified by SciePro's Medical Advisory Board.