ACOUSTIC STIMULATION OF INNER EAR BY APPLICATON OF SOUND INTO CAVITY OF MIDDLE EAR

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Abstract
An appropriate application of a reliable indicator of hearing in experiments on animals has enabled us to obtain important information on the physiopathologic functions of the ear. We have used the reflex of the muscle of the middle ear in otologic research on both animals and man for a considerable time. In this paper the problem of conduction and application of sound has been approached by means of experiments on animals. Our procedure developed from experiments on the labyrinthine pressure,1 in which the following method was used: A tube was inserted into the outer acoustic meatus of a rabbit and made air-tight. A second tube was fixed into the middle ear, and this opening was also firmly closed. Both tubes were connected with a syringe in which changes in pressure could be produced. A second connection was made with a manometer, by means of which the pressures

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