Details Origin incisive fossa of the maxilla Insertion nasal septum and back part of the alar part of nasalis muscle Nerve Buccal branch of the facial nerve Actions Depression of nasal septum. Dilutes the nares (nostril). Moves the apex of the nose during movement of upper lip (e.g. talking) Identifiers Latin musculus depressor septi nasi TA A04.1.03.012 FMA 46777 Anatomical terms of muscle