Fundic view of bony right internal auditory canal. The internal auditory canal has been drilled to visualize the domains or areas the facial and separate vestibulocochlear nerves enter. The facial canal for the facial nerve is separated from the superior vestibular nerve area by the vertical crest or Bill's bar. The facial nerve lies anterior to the superior vestibular nerve here. The transverse crest separates a superior compartment containing the facial and superior vestibular nerves from an inferior compartment containing the cochlear and inferior vestibular nerves. The cochlear area lies anterior to the inferior vestibular area. Posterior to the inferior vestibular foramen is the foramen singulare for the singular branch of the inferior vestibular nerve.