Posterior Dilator Naris, Anterior View

Description

Running across the lateral wall of the nasal vestibule, the posterior dilator naris is rendered from an anterior (frontal) perspective in an adult male face, positioned deep to the skin of the nasal ala and lateral to the cartilaginous nasal septum. Its fibers are shown adjacent to the alar cartilage, where they blend with the fibroareolar tissue of the nostril margin and neighboring slips of the nasalis, helping define the contour of the external naris. Surrounding craniofacial landmarks in the same plane include the nasal bones superiorly, the maxilla and zygomatic bones laterally, and the dental arches and mandible inferiorly, with the cervical vertebrae and hyoid indicated in the upper neck. Small muscle, tight real estate. An anterior view matters because clinicians and educators often struggle to localize the dilator naris within the crowded, layered anatomy of the nasal valve region, where subtle changes in alar position can affect airflow. Weakness or altered tone of the alar dilator complex contributes to external nasal valve collapse, a common complaint in functional rhinoplasty consults, and targeted support (alar batten grafts, lateral crural strut grafts, or suspension techniques) relies on clear mental mapping of these soft tissue attachments. For injectables, it also helps explain why toxin placed too medially into nasalis can worsen nasal obstruction in susceptible patients. Use this illustration in head and neck anatomy teaching to contrast the nasalis (compressor naris) with the posterior dilator naris, or in ENT and facial plastic surgery materials discussing nasal valve mechanics and alar support strategies. It also fits medical publishing needs for chapters on perinasal musculature, facial expression muscles, and surgical surface anatomy of the nose. Anatomical accuracy verified by SciePro's Medical Advisory Board.