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(A : Gx2300; B : Gx7000; C : Gx32000) Scanning electron micrographs of the 10-12 kHz region of the organ of Corti from guinea pig exposed to OBN8kHz at 100 dB SPL 6h/d for 5 days. (D : Gx2300; E: Gx7000) SEM of the 16 kHz region of the organ of Corti from a gentamicin -treated guinea pig (40 mg/kg for 8 days). IHC= inner hair cell; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row. Fusion of stereocilia and splayed stereocilia.

(A : Gx2300; B : Gx7000; C : Gx32000) Scanning electron micrographs of the 10-12 kHz region of the organ of Corti from guinea pig exposed to OBN8kHz at 100 dB SPL 6h/d for 5 days. (D : Gx2300; E: Gx7000) SEM of the 16 kHz region of the organ of Corti from a gentamicin -treated guinea pig (40 mg/kg for 8 days). IHC= inner hair cell; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row. Fusion of stereocilia and splayed stereocilia.