Alar Nasalis Muscle Beneath the Skin

Description

Beneath the reflected facial skin in lateral profile, the alar part of the nasalis muscle can be traced from the maxilla toward the alae of the nose, draping over the lateral nasal cartilages near the margin of the nostril. Anterior to the piriform aperture, its fibers lie superficial to the nasal cartilaginous framework and sit inferior to the nasal bone while approaching the soft tissue of the nasal tip. Posteriorly, the muscle occupies the nasofacial groove region, with the maxilla and teeth forming the bony backdrop and the mandible and external ear providing broader craniofacial orientation. Cartilage and bone boundaries remain clear. Alar nasalis is small, but it matters when you teach or operate around the external nasal valve. By dilating the naris during inspiration, it contributes to nasal airflow, and dysfunction or scarring in this layer can worsen dynamic nasal valve collapse after trauma, infection, or aggressive soft tissue reduction in rhinoplasty. Surgeons also use this anatomy to explain why incisions at the alar base can change nostril shape and why careful handling of the superficial musculoaponeurotic system and adjacent muscles, including levator labii superioris alaeque nasi, affects postoperative symmetry. Small muscle, big consequences. Use this illustration for otolaryngology and facial plastic surgery teaching files, craniofacial anatomy lab manuals, or patient-facing explanations of functional rhinoplasty and alar base procedures where you need bony landmarks paired with the subcutaneous muscular layer. It also supports head and neck courses that integrate the nasal skeleton, cartilage, and superficial mimetic musculature in one plate. Anatomical accuracy verified by SciePro's Medical Advisory Board.