Gyo K, Nishihara S, Yanagihara N
Department of Otolaryngology, Ehime University, Japan.
Acta Otolaryngol Suppl. 1988;456:87-91. doi: 10.3109/00016488809125083.
The inner ear pressure (PIE) in response to pressure changes in the external ear canal was measured in guinea pigs while alternatively opening and closing the perforation of the otic bulla. When the bulla was opened, only a transient degree of applied pressure was transmitted to the inner ear and the amplitude of the PIE was smaller than that of the corresponding PIE when the bulla was closed. This was because the applied pressure was exclusively transmitted to the inner ear via the ossicular chain. When the otic bulla was closed, the pressure was transmitted not only via the ossicular chain but also via the round window (RW) through the middle ear cavity. When the bulla was closed, the amplitude of PIE was larger by a positive pressure load than by the corresponding negative one. The amplitude of PIE showed a linear relationship to ear canal pressure of at least within the +/- 200 mmH2O range, as long as pressure was slowly applied to the ear canal. When the loading pressure was abruptly changed, a bouncing response, possibly reflecting elasticity of the RW, was evoked, which diminished or disappeared when the round window was artificially ruptured.
在豚鼠身上测量内耳压力（PIE）对外耳道压力变化的响应，同时交替打开和关闭听泡穿孔。当听泡打开时，只有短暂程度的施加压力传递到内耳，且PIE的幅度小于听泡关闭时相应PIE的幅度。这是因为施加的压力仅通过听骨链传递到内耳。当听泡关闭时，压力不仅通过听骨链传递，还通过中耳腔经圆窗（RW）传递。当听泡关闭时，正压负荷下PIE的幅度大于相应负压下的幅度。只要压力缓慢施加到耳道，PIE的幅度与耳道压力至少在+/- 200 mmHg2O范围内呈线性关系。当加载压力突然变化时，会诱发一种可能反映圆窗弹性的弹跳反应，当圆窗人工破裂时，这种反应会减弱或消失。
