Figure 5: Representative scanning electron micrographs of the organ of Corti (OC) from 32 kHz region. RX180 group shows subtle disarray of outer hair cell stereocilia. Disturbed and missing stereocilia (asterisks) are found in the RX90 and noise groups. Furthermore, note the fused, disarrayed inner hair cell stereocilia of the experimental groups. The degree of ultrastructural alterations at three frequency regions is demonstrated in the figure table. −: none (0-1); +: mild (2-3); ++: moderate (4-6); +++: severe (>7)