Fig. 3.

Epifluorescent immunocytochemistry analysis of organs of Corti: continuous noise exposure group (A-C) and repetitive noise exposure group (D-F). In the continuous impact noise exposure group, the three rows of outer hair cells and one row of inner hair cells were orderly and preserved in the cochlear apical turn (A). Some outer hair cell loss was observed in the middle and basal turns (B, C). In the repetitive impact noise exposure group, the disappearance of the orderly structural arrangement in the organ of Corti was more apparent in all turns of the cochlea, and deterioration was observed near the basal turn. More hair cells were preserved in the apical turn than in the basal one (D); outer hair cell loss was more severe in the basal turn (F).