An Anterior View of the Posterior Dilator Naris Muscle of a Male

Description

Arising from the maxilla near the canine fossa and blending into the alar cartilage and skin, the posterior dilator naris is presented from an anterior oblique angle that still lets you appreciate its posterior placement within the alar musculature. Fibers course superolaterally toward the ala nasi, lying deep to the nasalis and adjacent to the lateral crus of the greater alar cartilage. Medially, the muscle relates to the nasal vestibule and the margin of the naris, while laterally it approaches the nasolabial fold and the mobile soft tissues of the alar base. Small but specific. Functionally, this muscle contributes to nostril widening during forced inspiration and expressive facial movements, and it is one of the better landmarks for teaching how the nasal valve region is influenced by facial muscle tone. Surgeons working around the alar base encounter these fibers during rhinoplasty maneuvers that risk postoperative external nasal valve collapse if soft tissue support is altered, and injectors placing botulinum toxin for nasal flare or perinasal synkinesis need to understand its relationship to the nasalis and the alar rim. The anterior angle matters because it matches the clinical viewpoint at the bedside and in the operating room. Use this illustration in gross anatomy and head and neck courses when differentiating the nasal muscles (nasalis, levator labii superioris alaeque nasi, and the dilator naris components) and in facial anatomy modules for plastic surgery, ENT, and maxillofacial training. It also fits well in procedural atlases covering alar base reduction, rhinoplasty tip and valve support concepts, and perinasal chemodenervation planning. Anatomical accuracy verified by SciePro's Medical Advisory Board.