“…The dorsal cochlear nucleus, which is the most accessible portion of the cochlear nucleus com-plex for electrical stimulation, is positioned on the surface of the lateral recess of the fourth ventricle. Various landmarks, such as the seventh, eighth, and ninth cranial nerves, may be used to locate the foramen of Luschka, 4,5,14,15 which affords access to the fourth ventricle. Usually, the choroid plexus, which covers the foramen of Luschka, lies within a triangle formed by the seventh nerve, the ninth nerve, and the lip of the foramen of Luschka.…”