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Cross-sectional anatomy of guinea pig and human CPs. Colored bars show the radial extents of the OSL, the BM, and, in humans, the soft tissue “bridge” between the OSL and BM. (A) Guinea pig 10-kHz place (5.5 mm from the base) and (B) human 9-kHz place (6 mm from the base). (C) Magnified view showing the bridge region outlined with a dashed blue line. Other abbreviations are inner sulcus (IS) and spiral ligament (SL).
