Morphological basis for a tonotopic design of an insect ear
Morphological basis for a tonotopic design of an insect ear
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DOI：
10.1002/cne.24218
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发表时间：
2017-07-01
影响因子：
2.5
通讯作者：
Nowotny, Manuela
中科院分区：
文献类型：
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作者：
Hummel, Jennifer;Koessl, Manfred;Nowotny, Manuela
音调组织的听觉器官的蟋蟀提供了一个详细的相关性的听觉器官，需要建立音调梯度的形态和结构特性。在本研究中，我们结合联合收割机机械测量的声音引起的听觉器官的运动和详细的解剖调查，以探讨tonotopy的解剖学基础。我们比较机械数据的频率响应沿着听觉器官的几个解剖参数。低频响应与听觉器官近端部分的较大器官和帽细胞大小有关，而在器官远端部分，小器官和帽细胞大小与高频表示有关。然而，器官和帽细胞大小之间的相关性与连续的频率表示沿着器官不是很紧密。相反，器官的高度和感觉树突的相应长度与音调频率表征最相关。感觉树突含有纤毛根，其具有明显的电子致密材料交叉带，这对于树突的刚度应该是重要的。周围结构的几何形状，如血淋巴通道和听气管，以及覆膜的延伸不相关的tonotopy。我们提供的证据表明，tonotopy在蟋蟀听觉器官可能取决于纤毛结构的大小。特别是，感觉细胞的睫状根可能是tonotopy的细胞基础。
The tonotopically organized hearing organs of bushcrickets provide the opportunity for a detailed correlation of morphological and structural properties within hearing organs that are needed to establish tonotopic gradients. In the present study of a tonotopic insect hearing organ, we combine mechanical measurements of sound-induced hearing organ motion and detailed anatomical investigations to explore the anatomical basis of tonotopy. We compare mechanical data of frequency responses along the auditory organ to several anatomical parameters. Low frequency responses are related to larger organ and cap cell size in the proximal part of the hearing organ while in the distal part of the organ, small organ and cap cell size is related to high-frequency representation. However, the correlation between organ and cap cell size with continuous frequency representation along the organ is not very tight. Instead, the height of the organ and the corresponding length of the sensory dendrites are best correlated to tonotopic frequency representation. The sensory dendrite contains a ciliary root with a pronounced cross-banding of electron-dense material that should be important for the stiffness of the dendrite. The geometry of surrounding structures like the hemolymph channel and the acoustic trachea as well as the extension of the tectorial membrane are not correlated to the tonotopy. We provide evidence that tonotopy in the bushcricket hearing organ may depend on the size of ciliary structures. In particular, the ciliary root of the sensory cells is a likely cellular basis of tonotopy.