Depressor septi nasi
Depressor septi nasi
- Latin synonym: Musculus depressor septi nasi
- Synonym: Depressor septi nasi muscle
Definition
Depressor septi nasi | |
Origin | Incisive fossa of the maxilla |
Insertion | Lower part of nasal septum and alae |
Innervation | Facial nerve (buccal branch) |
Action | Depresses the nasal septum and opens nostrils |
The depressor septi nasi is a small paired muscle of facial expression that belongs to the nasal group of muscles. It draws the nasal septum and the tip of the nose downward, assisting in widening the nostrils.
Anatomical Details
1. Origin
From the incisive fossa on the anterior surface of maxilla, just above the central incisor tooth.
2. Insertion
Into the lower part of the nasal septal cartilage.
Innervation
Buccal branch of the facial nerve (cranial nerve VII).
Blood Supply
Branches of the facial artery, particularly the superior labial artery.
Action
Depresses the nasal septum by pulling it downwards, thereby aiding the alar part of nasalis muscle in opening the nostrils.
References
Fakoya AO, Hohman MH, Westbrook KE, et al. Anatomy, Head and Neck: Facial Muscles. [Updated 2024 Apr 20]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK493209/
Gray, H. (2016) Gray’s Anatomy: The Anatomical Basis of Clinical Practice. 41st edn. Edited by S. Standring. New York: Elsevier. Chapter 30: Face and Scalp, p. 489-496.
