The depressor septi nasalis muscles (DSN) (also known as the depressor septi nasi muscles) are paired muscles of the nose, a subset of the muscles of facial expression, which depress the nose.
- maxilla superior to the central incisor (incisive fossa)
- anterior nasal septum, passing to the medial crural footplates, terminating in the membranous septum
- buccal branches of the facial nerve (VII)
- depresses the tip of the nose