An Exterior Lateral View of the Male Anterior Dilator Naris Muscle

Description

Along the lateral aspect of the male external nose, the anterior dilator naris is rendered as a thin slip of muscle at the level of the ala nasi, blending anteriorly with the skin and fibrofatty tissue of the nasal vestibule. Its fibers sit superficial to the lateral nasal cartilage and course inferomedially toward the margin of the nostril, where they influence the contour of the alar rim. Superior and posterior to it, the nasalis (alar and transverse parts) and the elevator of the upper lip and wing of the nose (levator labii superioris alaeque nasi) form the neighboring muscular field. Small, but specific. Functionally, this lateral view matters because subtle muscular tone at the ala can determine whether the external nasal valve holds open during inspiration or collapses under negative pressure, a common contributor to symptomatic nasal obstruction in athletes and patients after rhinoplasty. Plastic and ENT surgeons reference this region when planning alar base reduction, nostril rim grafting, or correction of alar retraction, where over-resection of soft tissue or scarring can unmask dynamic collapse. For facial nerve assessment, the muscle’s movement can be discussed alongside other perinasal mimetic muscles supplied by the buccal branches of the facial nerve (CN VII). Use this illustration in head and neck anatomy teaching to clarify the layered organization of the superficial muscles of facial expression over the nasal cartilages, or in operative atlases addressing functional rhinoplasty and external nasal valve support. It also suits patient-facing surgical consent materials where a clear lateral reference of the ala and nostril margin helps explain why a small muscle can affect airflow and postoperative contour. Anatomical accuracy verified by SciePro's Medical Advisory Board.