A, The cerebellum has been elevated. A large AICA loops into the porus of the internal meatus. The junction of the facial nerve with the brainstem is located below and slightly in front of the vestibulocochlear nerve. B, The vestibulocochlear nerve has been elevated to provide additional exposure of the facial nerve. C, Choroid plexus protrudes from the foramen of Luschka into the cerebellopontine angle behind the glossopharyngeal and vagus nerves. A nerve hook has been placed inside the rhomboid lip, a pouch of neural tissue attached along the anterior margin of the lateral recess and extending laterally behind the glossopharyngeal and vagus nerves. D, Enlarged view of the rhomboid lip. (Images courtesy of AL Rhoton, Jr.)