abnormal ear morphology abnormal auditory bulla morphology 2017-09-21T11:33:05Z any structural anomaly of the hollow bony structure on the ventral, posterior portion of the skull that encloses parts of the middle and inner ear; in most species, it is formed by the tympanic part of the temporal bone MPheno.ontology abnormal bulla morphology abnormal bulla tympanica morphology abnormal tympanic bulla morphology abnormal auditory bullae MP:0030160