Decraemer W, Khanna S
Lab. of Biomedical Physics, University of Antwerp, RUCA, Belgium.
Acta Otorhinolaryngol Belg. 1995;49(2):139-45.
Malleus motion is classically regarded as a rotation about a fixed axis whose location is determined by the anatomy and suspension of the middle ear ossicles. In a previous paper (1) we have shown that the mode of vibration is complex and varies with frequency. To define the malleus motion in detail, its vibration was measured interferometrically at a large number of points (about 20) on the manubrium in anesthetized cat. The viewing direction was kept fixed. A pure tone stimulus was used and the frequency was changed from 100 Hz to 25 kHz. Assuming that the malleus moves as a rigid body the observed motion can be decomposed into three components; one translational component along the direction of viewing (z axis) and two rotational components characterized by rotation vector components in the plane perpendicular to the translational component. These motion components were calculated from the experimental data. Our results show that the direction of the malleus rotation axis is changing within each cycle. Results from different animals show large interanimal variations.
锤骨运动传统上被认为是围绕一个固定轴的旋转，该轴的位置由中耳听小骨的解剖结构和悬吊情况决定。在之前的一篇论文（1）中，我们已经表明其振动模式是复杂的且随频率变化。为了详细定义锤骨运动，我们在麻醉猫的锤骨柄上大量的点（约20个）处用干涉测量法测量了其振动。观察方向保持固定。使用纯音刺激，频率从100赫兹改变到25千赫兹。假设锤骨作为刚体运动，观察到的运动可以分解为三个分量；一个沿观察方向（z轴）的平移分量和两个旋转分量，其特征是在垂直于平移分量的平面内的旋转矢量分量。这些运动分量是根据实验数据计算出来的。我们的结果表明，锤骨旋转轴的方向在每个周期内都在变化。不同动物的结果显示出动物间的巨大差异。
