Ulfendahl M, Khanna S M, Heneghan C
Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden.
Neuroreport. 1995 May 30;6(8):1157-60. doi: 10.1097/00001756-199505300-00021.
To investigate the presence of the postulated shearing motion in the micromechanics of the inner ear during sound stimulations we measured the vibratory response of the tectorial membrane and the reticular lamina in the third cochlear turn in an isolated temporal bone preparation using confocal laser heterodyne interferometry. The mechanical response of the tectorial membrane had the same frequency of maxima as the underlying reticular lamina, but was not as sharply tuned. When the two-dimensional motion was calculated from measurements made from several viewing angles it was found that the vibration of the reticular lamina had significant components both normal and tangential to its surface. The tectorial membrane motion, however, was primarily in a direction approximately perpendicular to the surface of the reticular lamina. The results indicate that shearing motion is produced predominantly by the radial motion of the reticular lamina.
为了研究在声音刺激期间内耳微力学中假定的剪切运动的存在情况，我们使用共焦激光外差干涉测量法，在一个分离的颞骨标本中测量了耳蜗第三转中盖膜和网状板的振动响应。盖膜的机械响应与下方的网状板具有相同的频率最大值，但调谐没有那么尖锐。当从几个视角的测量结果计算二维运动时，发现网状板的振动在其表面的法向和切向都有显著分量。然而，盖膜的运动主要是在大致垂直于网状板表面的方向上。结果表明，剪切运动主要是由网状板的径向运动产生的。
