Abstract
Cats with the stapedius muscle tendon cut (tenotomized) and stapedius muscle intact (non-tenotomized) were exposed to white noise of specified intensities and durations. Their hearing thresholds were measured by behavioural audiometry, and the PTSs studied three months after the noise exposure. At the site of election of noise-induced hearing loss in cats (2 to 4 kHz) there was no essential difference in PTS between non-tenotomized and tenotomized cats. At frequencies below and above this frequency band the tenotomized animals showed greater PTS than the non-tenotomized. The stapedius muscle has a protective function which is frequency and intensity dependent, although it is found to occupy a subsidiary role in comparative anatomical and electrophysiological studies. However, its function is not primarily protective. The stapedius muscle probably serves the combined function of auditory perception and protection against hazardous noise.
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