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Figure 4. Average cochleogram obtained from (a) 26-month old control rats, (b) 5- month old 97dB noise - exposed rats. Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row. Figure 4. Average cochleogram obtained from (c) 26-month old 97dB noise - exposed rats. (d) 5 months old 700 ppm styrene - exposed rats. Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row. Figure 4. Average cochleogram obtained from (e) 26 months 700 ppm styrene - exposed rats. Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row.

Figure 4. Average cochleogram obtained from (a) 26-month old control rats, (b) 5- month old 97dB
noise - exposed rats. Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair cells; OHC2: second row; OHC3: third row.
Figure 4. Average cochleogram obtained from (c) 26-month old 97dB noise - exposed rats. (d) 5 months
old 700 ppm styrene - exposed rats.
Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral
course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to
Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair
cells; OHC2: second row; OHC3: third row.
Figure 4. Average cochleogram obtained from (e) 26 months 700 ppm styrene - exposed rats.
Noise and styrene schedule : 6 h/d, 5 d/w, 4 w. Abscissa - upper trace: length (mm) of the entire spiral
course of the organ of Corti from the bottom of the hook. - lower trace : frequency-map according to
Müller (1991). Ordinate: hair cell loss in percent. IHC: inner hair cells; OHC1: first row of outer hair
cells; OHC2: second row; OHC3: third row.