Depressor septi nasalis muscle

Last revised by Dr Daniel J Bell on 22 Sep 2021

The depressor septi nasalis muscles (DSN), also known as the depressor septi nasi muscles, are paired muscles of the nose, a subset of the facial muscles, which depress the nose.

Summary

Gross anatomy

Origin
  • maxilla superior to the central incisor (incisive fossa)
Insertion
  • anterior nasal septum, passing to the medial crural footplates, terminating in the membranous septum
Arterial supply
Venous drainage
Innervation
Action
  • depresses the tip of the nose 1

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