Origin: Incisive fossaof the maxilla
Insertion: Nasal septum and back part of the alar part of nasalis muscle
Nerve: Buccal branch of the facial nerve
Action: Depression of nasal septum
The Depressor septi (Depressor alœ nasi) arises from the incisive fossa of the maxilla; its fibers ascend to be inserted into the septum and back part of the ala of the nose. It lies between the mucous membrane and muscular structure of the lip.