inner ear morphology trait internal auditory canal morphology trait Any measurable or observable characteristic related to the shape, structure, color or pattern of 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. Trait.ontology VT:0004286 internal acoustic meatus morphology trait internal auditory meatus morphology trait meatus auditorius internus morphology trait