Posterior Dilator Naris Muscle, Anterior View

Description

Arising from the maxilla and adjacent nasal cartilages, the posterior dilator naris muscle is presented from an anterior perspective as a thin slip at the lateral margin of the piriform aperture, positioned superior to the nostril rim and lateral to the nasal septum. Its fibers blend with the alar cartilage and the surrounding nasalis complex, lying superficial to the cartilaginous framework but deep to the cutaneous tissues of the nasal ala. Nearby facial muscles are also apparent, including orbicularis oculi encircling the palpebral fissure, and the perinasal slips that converge toward the upper lip and cheek. Orientation is clear. Superior is toward the nasal bridge, inferior toward the upper lip. Clinically, this small alar dilator is easier to understand when you can see it in relation to the alar cartilage and the nasal valve region, where minor changes in muscle tone or scarring can alter airflow resistance out of proportion to the size of the structure. Rhinoplasty, alar base reduction, and reconstruction after trauma risk disrupting these delicate perinasal muscular insertions, and postoperative nasal obstruction is often explained to patients in terms of the external nasal valve and its soft tissue support. For facial reanimation planning, the anterior view also helps track how perinasal muscles coordinate with upper lip elevators during expression and speech. Small muscle, real consequences. Use this artwork in head and neck anatomy teaching, plastic surgery and ENT lecture slides on nasal valve mechanics, or as figure support in rhinoplasty, cleft nasal deformity, and facial expression chapters where precise perinasal muscle nomenclature matters. It also reads well for patient education materials that need an accurate, nonphotographic depiction of the nasal musculature in a male adult. Anatomical accuracy verified by SciePro's Medical Advisory Board.