Nasolabial Sulcus, Lateral View

Description

Shown in lateral profile, the nasolabial sulcus (nasolabial fold) runs inferolaterally from the ala of the nose toward the oral commissure, forming a clear boundary between the cheek and the upper lip. Superiorly, the crease relates to the lateral nasal wall and the maxilla beneath, while inferiorly it approaches the vermilion border and modiolus region where perioral muscles interdigitate. Subtle surface contouring implies the underlying lift of the levator labii superioris alaeque nasi and levator labii superioris, with the zygomaticus major/minor contributing more laterally to the malar and upper lip drape. Skin of higher melanin content is rendered with realistic tone variation, which affects shadow behavior along the fold. Facial aesthetics and reconstruction often hinge on this landmark because the nasolabial sulcus reflects both skeletal support from the maxilla and soft tissue tethering from mimetic musculature and retaining ligaments, so its depth changes with midface volume loss, maxillary hypoplasia, or postoperative scarring. Injectables and fat grafting commonly target the adjacent nasolabial region, but the facial artery and its superior labial branch typically course deep to the fold before becoming more superficial near the oral commissure, a relationship that informs safe cannula vectors and aspiration awareness. Surgeons also reference the sulcus when designing nasolabial flaps for nasal ala and columellar defects, using the crease to hide donor-site scars in a naturally occurring line. A key surface cue. Use this rendering in facial anatomy teaching for dentistry, plastic surgery, ENT, and dermatology, or in publications discussing facial aging, nasolabial flap planning, cleft lip and perioral scar revision, or injection technique on diverse skin tones. It also fits patient-education materials where a clean lateral view helps orient the fold relative to the nose, maxilla, and upper lip. Anatomical accuracy verified by SciePro's Medical Advisory Board.