abnormal inner ear morphology abnormal internal auditory canal morphology MP:0004286 MPheno.ontology abnormal internal acoustic meatus morphology abnormal internal auditory meatus morphology abnormal meatus auditorius internus morphology any structural anomaly in the canal beginning at the opening of the internal acoustic meatus in the posterior cranial fossa, passing laterally through the petrous portion of the temporal bone to end at the fundus, where a thin plate of bone separates it from the vestibule; it gives passage to the facial and vestibulocochlear nerves together with the labyrinthine artery and veins