Frequency representation in the emu basilar papilla
Frequency representation in the emu basilar papilla
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DOI：
10.1121/1.418145
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发表时间：
1997-03
影响因子：
2.4
通讯作者：
C. Köppl;G. Manley
中科院分区：
文献类型：
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作者：
C. Köppl;G. Manley
用辣根过氧化物酶电离子透入法记录单个听觉传入神经，研究了鸸鹋基底乳头的频率表征。成功标记的纤维覆盖的特征频率范围从0.05至3.3 kHz，这相当于近90%的总乳头长度。基底乳头内标记纤维的终止部位与其特征频率相关，最低频率出现在顶部，最高频率出现在底部。频率分布的最佳数学描述由指数回归给出，均匀映射常数为0.8 mm/倍频程。该函数偏离了更常见的空间常数向更高频率增加的模式。大多数标记纤维只支配一个毛细胞，那些接触4个或更多的毛细胞都是低的特征频率（~ 0.11 kHz）。所有标记的纤维终止于基底乳头宽度的56%以内。这种神经支配模式与在其他鸟类中观察到的一致。没有确凿的证据表明，神经支配的位置在整个乳头的宽度的敏感性和/或频率选择性的变化。
The frequency representation on the basilar papilla of the emu was investigated by recording from single auditory afferents and labeling them iontophoretically with horseradish peroxidase. Successfully labeled fibers covered a range of characteristic frequencies from 0.05 to 3.3 kHz, which corresponded to nearly 90% of the total papillar length. The termination sites of labeled fibers within the basilar papilla correlated with their characteristic frequency, the lowest frequencies being represented apically, the highest basally. The best mathematical description of the frequency distribution was given by an exponential regression, with a uniform mapping constant of 0.8 mm/octave. This function deviates from the more commonly observed pattern of increasing space constant towards higher frequencies. Most labeled fibers innervated only one hair cell; those contacting 4 or more hair cells were all of low characteristic frequency (⩽0.11 kHz). All labeled fibers terminated within the neural 56% of the basilar papilla’s width. This innervation pattern is consistent with that observed in other bird species. There was no conclusive evidence for a change of sensitivity and/or frequency selectivity with innervational position across the papilla’s width.