Cochlear Pathology in Monkeys Exposed to Impulse Noise.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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The cochleae of ten rhesus macaque monkeys exposed to impulse noise were examined using the surface preparation technique. There was great variability in the severity and extent of damage observed. All inner ears suffered destruction of Corti organ and myelinated nerve fibers along the initial segment of the basilar membrane. Further damage, limited mainly to outer hair cells, peaked at 8 to 10 mm. Generally the third or outermost row of outer hair cells lost the highest percentage of cells. Transitions between normal and damaged areas were abrupt. Hensens cells were split away from Deiters cells in the lower basal turn in half the animals. Inner hair cells, myelinated nerve fibers, and reticular lamina were resistant to destruction except in the hook area. Author
- Medicine and Medical Research