has part has part has_part characteristic of has modifier abnormal tympanic cavity morphology absent tympanic cavity 2017-09-21T08:32:14Z MPheno.ontology MP:0030155 absent middle ear cavity absence of the small, air-filled, mucosa-lined cavity that is located in the petrous portion of the temporal bone and houses the auditory ossicles and intratympanic muscles (tensor tympani and stapedius) as well as the chorda tympani and the tympanic plexus of nerves abnormal absent tympanic cavity