Alar Nasalis Muscles, Lateral View

Description

Arising from the anterior maxilla and blending into the fibrocartilage of the nasal ala, the alar part of the nasalis muscle is positioned inferior to the nasal bones and anterior to the piriform aperture, where it can be contrasted with the more superior transverse part of nasalis that courses across the dorsum of the nose. From this lateral perspective, the muscle belly sits superficial to the lateral nasal cartilage and lies anterior to the maxillary sinus region, while the alar margin curves anteroinferiorly toward the nostril rim. Bony landmarks anchor the orientation, including the nasal bone, frontal process of the maxilla, and the alveolar process bearing the maxillary dentition. The cervical vertebrae (C1 to C7) align posteriorly, framing head posture and the skeletal context without overlying soft tissue. Functionally, the alar nasalis influences nostril aperture by drawing the ala toward the septum, a motion often discussed alongside the opposing dilator naris fibers when teaching nasal valve mechanics. Small muscle, real implications. This view helps clarify how subtle changes in alar position can affect airflow resistance at the external nasal valve, a point that becomes clinically relevant in evaluation of nasal obstruction, facial nerve palsy affecting nasal flaring, and in planning rhinoplasty maneuvers that alter alar base position and support. Use this illustration for head and neck anatomy teaching, plastic and reconstructive surgery texts covering nasal base reduction or external nasal valve collapse, and ENT education on functional nasal airflow. It also suits clinical slide decks that need clean skeletal landmarks to orient surface anatomy of the nose in a male adult. Anatomical accuracy verified by SciePro's Medical Advisory Board.