Depressor Septi Nasi - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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 (2026) 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 Frequent questions What is the function of the depressor septi nasi muscle? The depressor septi nasi muscle helps widen the nasal opening by pulling the nasal septum downwards. This action is particularly important for facial expressions and nasal airflow. Where does the depressor septi nasi muscle originate and insert? This muscle originates from the maxilla, specifically above the medial incisor tooth, and inserts onto the nasal septum. Its strategic positioning allows it to effectively influence the shape of the nasal opening. What nerves innervate the depressor septi nasi muscle? The depressor septi nasi is innervated by the buccal branches of the facial nerve. This nerve supply is crucial for the muscle's function in facial expressions. What is the blood supply for the depressor septi nasi muscle? The facial artery provides the blood supply to the depressor septi nasi muscle. Adequate blood flow is essential for muscle function and overall nasal health. How does the depressor septi nasi contribute to facial expression? The depressor septi nasi muscle contributes to facial expression by enabling the widening of the nasal opening, which can enhance emotional expressions. Its role in altering nasal shape is significant during various facial movements. Rate This Article