Depressor septi nasi muscle
The depressor septi (depressor alae nasi) arises from the incisive fossa of the maxilla.
| Depressor septi nasi | |
|---|---|
 Muscles of the head, face, and neck. | |
| Details | |
| Origin | incisive fossa of the maxilla |
| Insertion | nasal septum and back part of the alar part of nasalis muscle |
| Nerve | Buccal branch of the facial nerve |
| Actions | Depression of nasal septum. Constricts the nares (nostril). Moves the apex of the nose during movement of upper lip (e.g. talking) |
| Identifiers | |
| Latin | musculus depressor septi nasi |
| TA | A04.1.03.012 |
| FMA | 46777 |
| Anatomical terms of muscle | |
Its fibers ascend to be inserted into the nasal septum and back part of the alar part of nasalis muscle.
It lies between the mucous membrane and muscular structure of the lip.
Action
The depressor septi is a direct antagonist of the other muscles of the nose, drawing the ala of the nose downward, and thereby constricting the aperture of the nares.
Works like the alar part of the nasalis muscle.
Additional images
Position of depressor septi nasi muscle (shown in red).
References
This article incorporates text in the public domain from page 382 of the 20th edition of Gray's Anatomy (1918)
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