Nasalis Muscle, Anterior View

Description

Centered on the external nose, the nasalis muscle is presented in anterior view with its transverse (compressor naris) fibers spanning superomedially across the nasal dorsum and its alar (dilator naris) slips descending inferolaterally toward the lateral crus region of the alar cartilage. Laterally, the muscle blends with adjacent facial mimetic musculature over the maxilla, while medially it approaches the nasal septum and dorsum. Surrounding bony landmarks of the viscerocranium are visible, including the nasal bones superiorly, the maxilla and anterior nasal aperture inferiorly, and the orbital margins superolaterally. Inferior to the facial skeleton, the upper cervical vertebrae appear in line with the cranial base, clarifying the head-on anatomical orientation. Nasalis matters because it is the principal sphincter and modulator of the nostril, balancing nasal valve patency against compression during speech, facial expression, and respiration. Weakness or asymmetry after facial nerve injury (most often involving the zygomatic and buccal branches) can alter alar flare and contribute to subjective nasal obstruction, even when intranasal structures are otherwise intact. The anterior perspective also supports teaching of injection anatomy, where botulinum toxin placed too medially or deeply can affect nearby levator labii superioris alaeque nasi and change upper lip and nasal movement. Small muscle, big cosmetic consequences. Use this illustration in head and neck anatomy teaching to correlate the nasal bones, maxilla, and nasal aperture with the transverse and alar components of nasalis, and in otolaryngology or facial plastics content discussing nasal valve function and alar dynamics. It also fits well in dental, maxillofacial, and aesthetic medicine references that need an anterior map of perinasal mimetic muscles against clear craniofacial landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.