FIG. 4.

Topography of cochlear nerve and nucleus in the cat (reprinted from Arnesen and Osen, 1978 with permission from the publisher). The projections from the apical, middle, and basal turns to the cochlear nucleus are indicated with lines varying in thickness. The two cross sections (lower right, labeled I and II) show the approximate locations within the nerve of fibers from various cochlear turns. Medium, clear, and dense shading indicate fibers from the basal, middle, and apical turns, respectively. The line in cross section II indicates a typical placement of the stimulating array, estimated on the basis of frequency-specific responses recorded in the ICC and post-mortem dissections. Abbreviations: AVCN: anterior ventral cochlear nucleus; DCN: dorsal cochlear nucleus; CNR: cochlear nerve root; GB: glial border; LF: low frequency; HF: high frequency.