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Posterosuperior View of Right Internal Acoustic Meatus

Surgical Correlation

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Posterosuperior view of right internal acoustic meatus. The cerebellum has been reflected away and bone removed at the internal acoustic meatus to visualize the facial (CN VII) and vestibulocochlear (CN VIII) nerves entering the meatus. More distally within the meatus, the transverse crest separates the facial and superior vestibular nerves from the cochlear and inferior vestibular nerves. The anterior inferior cerebellar artery (AICA) arises from the basilar artery and often passes between CN VII and CN VIII and shows its premeatal and meatal segments. The labyrinthine artery most commonly branches from AICA and accompanies CN VIII to the inner ear. The nervus intermedius is part of CN VII that contains sensory and parasympathetic fibers. Glossopharyngeal (CN IX) and vagus (CN X) nerves can be seen entering the jugular foramen. (Image courtesy of AL Rhoton, Jr.)

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