Depressor septi nasi muscle explained

Depressor septi nasi
Latin:musculus depressor septi nasi
Origin:Incisive fossa of the maxilla
Insertion:Nasal septum and back part of the alar part of nasalis muscle
Action:Depresses nasal septum, constricts nostril, moves apex of nose during movement of upper lip (e.g. talking)
Nerve:Buccal branch of the facial nerve

The depressor septi nasi muscle (or depressor alae nasi muscle) is a muscle of the face. It connects the incisive fossa of the maxilla and the orbicularis oris muscle to the nasal septum of the nose. It draws the ala of the nose downwards, reducing the size of the nostrils.

Structure

The depressor septi nasi muscle arises from the incisive foramen of the maxilla.[1] It may also partially originate from the orbicularis oris 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 the muscular structure of the lip.

Function

The depressor septi is a direct antagonist of the other muscles of the nose, drawing the ala of the nose downward, constricting the nostrils.

It works like the alar part of the nasalis muscle.

Clinical significance

During rhinoplasty, repositioning of the head of the depressor septi nasi muscle ensures normal nose position after surgery.[2] Various approaches may be used, with similar results.

Notes and References

  1. Sinno. Sammy. Chang. Jessica B.. Saadeh. Pierre B.. Lee. Michael R.. May 2015. Anatomy and Surgical Treatment of the Depressor Septi Nasi Muscle: A Systematic Review. Plastic and Reconstructive Surgery. en-US. 135. 5. 838eā€“848e. 10.1097/PRS.0000000000001169. 25919266. 20984532. 0032-1052.
  2. Rohrich. R J. Huynh. B. Muzaffar. A R. Adams. W P. Robinson. J B. 1 January 2000. Importance of the depressor septi nasi muscle in rhinoplasty: anatomic study and clinical application. Plastic and Reconstructive Surgery. 105. 1. 376ā€“83; discussion 384ā€“8. 10.1097/00006534-200001000-00059. 1529-4242. 10627007.