ホログラフィ干渉法による聴覚生理の研究--アブミ骨の振動様式について

概要

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The stapes is considered as the most important one among the auditory ossicles, which transmits air borne sound into the inner ear fluid. The vibratory mode of the stapes footplate was analysed by means of holographic interferometry. The technique used was time-averaged holography with the light source of helium-neon laser, the wave length of which was 6328A. As the material for this study, ten temporal bone specimens taken from the human cadaver were used, and each specimen was treated as to be observed at the footplate from the inner ear side. From the external ear canal side, the tympanic membrane of each specimen was vibrated with test sound generated from a speaker. Test tones ranged from 250Hz to 8, 000Hz in frequency, from 80dB to 110dB in intensity, and holograms were recorded and reconstructed.Conclusion is that, as the intensity of the test sound increased, the way of vibration of the stapes footplate turned from piston-like movement to the hinged motion around a virtual axis behind the oval window crossing to long axis of the footplate at from 35 to 55 degrees.
社団法人日本耳鼻咽喉科学会の論文