Depressor septi nasi

  • The depressor septi nasi (also depressor septi nasi muscle or depressor septi, latin: musculus depressor septi nasi) is a facial muscle located in the lower nose region. It may be absent or rudimentary.

    Origin

    The depressor septi nasi originates from the incisive fossa of the maxilla.

    Insertion

    The depressor septi nasi inserts into the nasal septum and the posterior aspect of the alar part of the nasalis muscle.

    Action

    Upon contraction the depressor septi nasi depresses the nasal septum and pulls the wings of the nose downward, constricting the aperture of the nostrils, thus working similarly as the alar part of the nasalis muscle.

    Innervation

    The depressor septi nasi receives nerve supply from the buccal branch of the facial nerve (CN VII).

    Blood supply

    The depressor septi nasi is supplied by the superior labial branch of the facial artery.