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Organ of Corti (OC) ordinal grading system is depicted with representative histologic sections at 20× magnification. Scale bar = 100 μm. 5 = normal OC architecture, presence of inner and outer hair cells, inner hair cell (IHC) cilia visible. 4 = normal OC architecture, presence of IHC and outer hair cell (OHC), no IHC cilia visible. 3 = abnormal IHC and/or OHC, tunnel of Corti open. 2 = tunnel of Corti collapsed. 1 = single cell layer.
