Depressor Septi Nasi Muscle Under the Dermal Layer, Anterior View

Description

Exposed beneath the dermis in an anterior facial dissection, the depressor septi nasi is seen arising from the maxilla in the midline above the incisor region and coursing superiorly toward the nasal septum and medial crura of the alar cartilages. Inferiorly, its fibers blend with the superior margin of the orbicularis oris and interdigitate with adjacent upper lip musculature near the philtrum. Lateral to this midline slip, the levator labii superioris alaeque nasi (highlighted) runs superior to the upper lip toward the frontal process of the maxilla, framing the nasal ala and helping define the nasolabial region. Bony landmarks of the anterior skull, including the anterior nasal aperture, maxilla, and dental arcade, orient the muscle’s attachments. Surgeons and injectors care about this small muscle because it directly influences dynamic nasal tip position and upper lip movement. Overactivity of the depressor septi nasi can contribute to tip depression and widening of the nostrils on smiling, and it is commonly addressed during functional or aesthetic rhinoplasty as well as in targeted botulinum toxin treatments. Its close relationship to orbicularis oris also explains why interventions in the upper lip can unintentionally alter nasal tip dynamics. Small muscle. Big consequences. Use this anterior, subdermal view to teach perinasal muscular anatomy in head and neck gross anatomy, facial plastic surgery, or aesthetic medicine modules, and to illustrate discussions of rhinoplasty maneuvers, smile-related tip ptosis, and injection planning around the upper lip and nasal base. Suitable for textbooks, surgical atlases, patient education on rhinoplasty goals, and procedural consent materials. Anatomical accuracy verified by SciePro's Medical Advisory Board.