Pars transversa musculi nasalis (click on link to right of "Synonyms") arises from the maxilla above the root of the canine tooth on each side and forms an aponeurosis across the bridge of the nose. This term means the crosswise part of the nasal muscle. Action: depresses the cartilage of the nose and compresses (constricts) the nostrils. Nerve supply: facial nerve. See "Comments" on musculus nasalis.