nasolabial

Nasolabial is an anatomical descriptor referring to the region between the nose and the upper lip. The term is applied to structures, contours, and movements in this area and is commonly used in anatomy, radiology, surgery, and cosmetic medicine. A central feature of the nasolabial region is the nasolabial fold, a skin groove that extends from the alar base of the nose to the oral commissure.

Anatomy: The nasolabial region is bounded by the nose above and the upper lip below. It overlies the underlying facial muscles including the levator labii superioris alaeque nasi and the zygomaticus major/minor, which shape expressions such as smiling. The nasolabial folds reflect the movement of these muscles and the support from midfacial fat and bone; aging or weight loss can cause the folds to deepen.

Clinical relevance: In aging and facial rejuvenation, the depth of nasolabial folds is a common consideration; dermal fillers, fat grafting, or surgical lifts are used to reduce prominence. The nasolabial angle, formed where the base of the nose meets the upper lip, is assessed in rhinoplasty planning and facial analysis.

Other terms: In rare cases, the term nasolabial is associated with nasolabial cyst, a nonodontogenic cyst presenting as swelling in the nasolabial region that may require surgical excision.