Fig. 9. Cochlear histology of control (A, A', B,B') and unilateral ablation cases (C, D, and E,F). A', B', Low-magnification photomicrographs of the left and right cochleas in a control case. Dashed inset boxes are shown at higher magnification in A and B.SV, Scala vestibuli; SM, scala media;ST, scala tympani; SG, spiral ganglion;StV, stria vascularis. C,D, Photomicrographs of the ablated (C) and intact side (D) in an experimental case. Note the atrophied stria vascularis, the absence of Reissner's membrane (RM), and the lack of hair cells on the ablated side. The spiral limbus (SL) was left intact, and there was no evidence of degeneration in the spiral ganglion. E, F, Photomicrographs of the ablated (E) and intact side (F) in an experimental case with a more complete ablation. Despite abundant debris in the cochlear spaces, remnants of the spiral limbus were distinguishable. Considerable degeneration of the spiral ganglion was apparent on the ablated side in this and similar cases. Scale bars: A′, B′, 500 μm; A–F, 100 μm.