Anatomical evidence for binaural processing in the descending octaval nucleus of the toadfish (Opsanus tau)
Anatomical evidence for binaural processing in the descending octaval nucleus of the toadfish (Opsanus tau)
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DOI：
10.1016/s0378-5955(98)00097-5
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发表时间：
1998-09-01
期刊：
影响因子：
2.8
通讯作者：
Edds-Walton, PL
中科院分区：
文献类型：
--
作者：
Edds-Walton, PL
在蟾鱼（Opsanus tall）的髓质中确定了潜在听觉回路的连接。荧光葡聚糖胺放置在内侧圆枕（MTS）逆行填充细胞主要在背侧区的下降octaval核（DON）与对侧优势。荧光葡聚糖胺放置在DON显示连合纤维，跨越中线与内部弓状束。的互连是一致的背腹组织的DON：互惠神经支配是存在的DON的左，右背侧区和左，右腹侧区的DON。根据预测的内侧（听觉）TS和相互连接，背侧区域的DON似乎是主要的听觉处理网站在延髓，也可能是一个网站的方向，双耳比较。DON的腹侧区可能是双侧前庭处理的部位。双标记实验表明，一些下行octaval细胞投射到对侧DON也投射到mTS。基于这项研究所表明的听觉通路，未来的神经生理学研究的敏感性定向声刺激应该开始在背DON的蟾鱼。(C)1998 Elsevier Science B.V.保留所有权利。
The connections of a potential auditory circuit were determined in the medulla of the toadfish (Opsanus tall). Fluorescent dextran amines placed in the medial torus semicircularis (mTS) retrogradely filled cells primarily in the dorsal region of the descending octaval nuclei (DON) with contralateral predominance. Fluorescent dextran amines placed in the DON revealed commissural fibers that cross the midline with the internal arcuate tract. The interconnections are consistent with a dorsal-ventral organization of the DON: reciprocal innervation is present for the left and right dorsal zones of the DON and for the left and right ventral zones of the DON. Based on projections to the medial (auditory) TS and the reciprocal connections, the dorsal region of the DON appears to be the major auditory processing site in the medulla and also may be a site for directional, binaural comparisons. The ventral region of the DON may be a site for bilateral vestibular processing. Double-labelling experiments revealed that some of the descending octaval cells projecting to the contralateral DON also project to the mTS. Based on the auditory pathway indicated by this study, future neurophysiological investigations of sensitivity to directional sound stimuli should begin in the dorsal DON of the toadfish. (C) 1998 Elsevier Science B.V. All rights reserved.