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The Depressor Septi Nasi is a muscle of facial expression of the nose. The muscles of facial expression of the nose are:
- Depressor Septi Nasi
- Levator Labii Superioris Alaeque Nasi (also a muscle of facial expression of the mouth)
- Maxilla to the cartilage of the nose.
- The superior attachment is into both the septum (hence the name) of the nose and the alar cartilage of the nose.
- Constricts the nostril.
NOTE: The nasalis also constricts the nostril.