The depressor septi nasi is a nasal muscle of facial expression. It assists the alar part of the nasalis muscle in widening the nasal opening. Attachments – Originates from the maxilla (above the medial incisor tooth) and inserts onto the nasal septum. Actions – Pulls the nasal septum inferiorly to widen the nasal opening. Innervation – Buccal branches of the facial nerve. Blood Supply – Facial artery By TeachMeSeries Ltd (2025) Fig 1The nasal muscles of facial expression. Note the nasalis muscle is comprised of two parts. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Print Article Rate This Article