Gleich O
Institut für Zoologie der Technischen Universität München, Garching, F.R.G.
Hear Res. 1989 Feb;37(3):255-67. doi: 10.1016/0378-5955(89)90026-9.
Despite the independent evolution of birds and mammals, a number of structural similarities of their hearing organs have developed in parallel. By tracing the peripheral origin of functionally-characterized primary neurons, the present study demonstrates functional similarities between the respective hair cell populations of the hearing organs of birds and mammals. The space devoted to one octave on the starling's basilar papilla is not constant over the whole length; rather it increases from the apical low- to the basal high-frequency end. The finding that (with the exception of a specialized area near the apical end) only tall hair cells situated on the neural limbus receive active afferent innervation is a functional parallel to the mammalian inner hair cells. The thresholds of afferents increase with distance of the related hair cells from the neural side of the papilla and cover a range of more than 50 dB within the area of tall hair cells.
尽管鸟类和哺乳动物是独立进化的，但它们的听觉器官在结构上仍有许多相似之处并行发展。通过追踪功能特征明确的初级神经元的外周起源，本研究揭示了鸟类和哺乳动物听觉器官各自毛细胞群体之间的功能相似性。在椋鸟的基底乳头体上，用于一个八度音程的空间在整个长度上并非恒定不变；相反，它从顶端的低频端向基底的高频端增加。研究发现（顶端附近的一个特殊区域除外），只有位于神经嵴上的高毛细胞接受活跃的传入神经支配，这在功能上与哺乳动物的内毛细胞相似。传入神经的阈值随着相关毛细胞与乳头体神经侧距离的增加而升高，在高毛细胞区域内覆盖超过50分贝的范围。
