Okano K
Department of Otolaryngology, Okayama University Medical School.
Nihon Jibiinkoka Gakkai Kaiho. 1990 Nov;93(11):1847-55. doi: 10.3950/jibiinkoka.93.1847.
The influence of middle ear liquid on the tympanic membrane (TM) vibration was studied using the holographic interferometry. The physiological saline solution was injected into the middle ear cavity of the canine temporal bone. The liquid volume in the middle ear cavity was changed into 3 grades in order to observe the difference of the vibration pattern between them. The vibratory patterns of a normal canine TM remained unchanged in their first mode up to a frequency of approximately 2 kHz. In this mode, there were peak displacement regions in the posterior and anterior quadrants. The TM vibrations showed sectional patterns, above 3 kHz in the posterior and above 4 kHz in the anterior. After liquid retention, the following were observed. 1. The frequency at which sectional patterns occurred shifted to a lower frequency in the immerged portion, but showed no definite tendency in the unimmerged portion. 2. Maximum amplitudes of the anterior and posterior quadrants of the TM and the mallar tip shifted to somewhat higher frequencies for the liquid volume below the level of the tip portion, but contrary, shifted to lower frequencies for the liquid volume there above. 3. The ossicular chain tended not to make normal function for the TM vibration with an increase of liquid volume.
采用全息干涉术研究了中耳积液对鼓膜（TM）振动的影响。将生理盐溶液注入犬颞骨的中耳腔。中耳腔内的液体体积分为3个等级，以观察它们之间振动模式的差异。正常犬鼓膜的振动模式在其第一模态下，频率高达约2kHz时保持不变。在该模态下，后象限和前象限存在峰值位移区域。鼓膜振动呈现出分段模式，后象限在3kHz以上，前象限在4kHz以上。积液后，观察到以下情况。1. 出现分段模式的频率在浸入部分向较低频率偏移，但在未浸入部分没有明确的趋势。2. 对于低于锤骨尖端水平的液体体积，鼓膜前、后象限以及锤骨尖端的最大振幅向略高的频率偏移，但相反，对于高于该水平的液体体积，最大振幅向较低频率偏移。3. 随着液体体积的增加，听骨链对鼓膜振动往往不能发挥正常功能。
