Dilator naris anterior

  • The dilator naris anterior (also dilator naris anterior muscle, apicis nasi, latin: musculus dilator naris anterior) is a muscle of the nose that encircles the nostril and participates in widening it.

    Sometimes the dilator naris anterior along with the dilator naris posterior are referred to as parts of the nasalis muscle.

    The dilator naris anterior together with the alar part of the nasalis also may function to prevent collapse of the nasal valve during inspiration.

    Origin

    The dilator naris anterior originates from the upper lateral cartilage and the alar portion of the nasalis.

    Insertion

    The dilator naris anterior inserts into skin at the caudal margin of the lateral crus and the lateral alar crus.

    Action

    Upon contraction the dilator naris anterior dilates the nostril.

    Innervation

    The dilator naris anterior is innervated by the buccal branch of the facial nerve (CN VII).