meatus, pi. meafu^

(me-a'tus) [L, pa age.] pa age or channel, especially the external opening of a canal, ezter'nal au'ditory n., m. acusticus extemus. fish-mouth m., a red and swollen condition of the lips of the meatus urinarius in gonorrhea, inter'nal au'ditory m., m. acusticus intern us. m. acus'tic us exter'nus [BNA], external acoustic or auditory m., the pa age leading inward through the tympanic portion of the temporal bone, from the auricle to the membrana tympani; it consists of an o eous (internal) portion and a fibro cartilaginous (external) portion, m. acus'tic us inter'nus [BNA], internal acoustic or internal auditory m., a canal running from the internal auditory foramen, or acoustic pore, through the petrous portion of the temporal bone, ending at the fundus where a thin plate of bone separates it from the vestibule; it gives pa age to the facial and auditory nerves and the pars intermedia of Wrisberg, together with the auditory branch of the basilar artery and the internal auditory veins, m. na'si [BNA], the three pa ages in the nasal cavity formed by the projection of the turbinated bodies; the inferior m. li«s below the inferior turbinated, the middle m. between the middle and inferior turbinated, the superior m. between the superior and middle turbinated, m. na''sopharynge'us[BNA], posterior nares,thepharyngeajopeningof the nostrils. m. urina'rius, orificium urethrae externum [BNA], the external opening of the urethra.