Jorgensen F O
Acta Physiol Scand. 1977 Aug;100(4):393-403. doi: 10.1111/j.1365-201X.1977.tb00002.x.
The CM-intensity function (i.e. the relation between the amplitude of the cochlear potential (CM) and the sound pressure level) of the avian ear has previously been shown to deviate from the mammalian ear with respect to the slope of the linear part of the function. The lower slope values found in the perilymphatic space of the avian ear have been interpreted to indicate a damping influence of the tegmentum vasculosum on the mechanical vibration of the basilar membrane. In this study the CM-intensity function has been examined on either side of the tegmentum vasculosum of the pigeon ear using microelectrode technique. The slope of the linear part of the CM-intensity function in scala vestibuli was found to be a function of the sound frequency approaching unity at higher frequencies. In ductus cochlearis the slope of the linear part of the CM-intensity function was close to unity at most frequencies except the best frequency for the electrode position. At this frequency (3-4 kHz) the slope value was low. These findings from the ductus cochlearis are similar to findings in scala media of the mammalian ear. Thus the influence of tegmentum vasculosum on CM in scala vestibuli may be due to passive electrical properties of the tissue and not to the mechanical vibration of the basilar membrane.
先前的研究表明，鸟类耳朵的耳蜗微音器电位强度函数（即耳蜗电位（CM）的振幅与声压级之间的关系）在函数线性部分的斜率方面与哺乳动物的耳朵不同。在鸟类耳朵的外淋巴间隙中发现的较低斜率值被解释为表明血管纹对基底膜机械振动的阻尼影响。在本研究中，使用微电极技术在鸽耳血管纹两侧检查了CM强度函数。发现前庭阶中CM强度函数线性部分的斜率是声频的函数，在较高频率下接近1。在蜗管中，除电极位置的最佳频率外，CM强度函数线性部分的斜率在大多数频率下接近1。在该频率（3 - 4 kHz）时，斜率值较低。蜗管的这些发现与哺乳动物耳朵中阶的发现相似。因此，血管纹对前庭阶中CM的影响可能是由于组织的被动电学特性，而不是基底膜的机械振动。
