McCormick C A, Braford M R
Department of Biology, Oberlin College, Ohio 44074.
Brain Behav Evol. 1994;43(4-5):189-205. doi: 10.1159/000113634.
Cytoarchitectural analysis of the octavolateralis area of the goldfish, Carassius auratus, reveals that as in other teleosts, five first-order octaval nuclei are present: the anterior octaval, magnocellular, descending, tangential, and posterior octaval nuclei. The descending nucleus appears to be anatomically specialized relative to that of the halecomorph Amia calva and many teleosts in that a large dorsomedial subpopulation of the nucleus lies medial to nucleus medialis, a first-order lateral line nucleus. In addition to this dorsomedial zone, the descending nucleus is made up of an intermediate and a ventral zone. Application of horseradish peroxidase (HRP) to individual inner ear endorgans reveals that the distribution of these afferents to the octaval nuclei is generally similar to that in another otophysan, Ictalurus punctatus [McCormick and Braford, 1993]. Nucleus magnocellularis receives a diffuse projection from all of the endorgans. The semicircular canals project heavily to the nucleus tangentialis, the entire ventral zone and portions of the intermediate zone of the descending nucleus, the ventral portion of the caudal anterior nucleus, and the bulk of the rostral anterior nucleus. The macula neglecta projects to the intermediate zone of the descending nucleus and to ventral locations within the dorsal half of the caudal anterior nucleus. The otolithic endorgans--the saccule, lagena, and utricle--project, in an overlapping manner, to the dorsal half of the caudal anterior nucleus and minimally to the rostral anterior nucleus. The inputs of the otolithic endorgans to the intermediate zone of the descending nucleus are more segregated, though a given region is sometimes supplied by more than one endorgan. The projections of the saccule tend to be concentrated more medially than those of the other two endorgans. The dorsomedial zone of the descending nucleus receives the majority of its primary input from the saccule, and a much smaller input from the lagena, over most of its rostrocaudal extent. At caudal-most levels of the dorsomedial zone, afferents from the three otolithic endorgans overlap.
对金鱼（Carassius auratus）八侧线区的细胞结构分析表明，与其他硬骨鱼一样，存在五个一级八分体核：前八分体核、大细胞性核、下行核、切线核和后八分体核。与雀鳝Amia calva和许多硬骨鱼相比，下行核在解剖学上似乎具有特殊性，因为该核的一个大的背内侧亚群位于内侧线一级核——内侧核的内侧。除了这个背内侧区，下行核还由一个中间区和一个腹侧区组成。将辣根过氧化物酶（HRP）应用于单个内耳终器，结果显示这些传入纤维到八分体核的分布通常与另一种骨鳔鱼类——斑点叉尾鮰（Ictalurus punctatus）相似[麦考密克和布拉德福德，1993年]。大细胞性核接受来自所有终器的弥散性投射。半规管大量投射到切线核、下行核的整个腹侧区和中间区的部分区域、尾侧前核的腹侧部分以及吻侧前核的大部分区域。忽略斑投射到下行核的中间区以及尾侧前核背侧半的腹侧部位。耳石终器——球囊、瓶状囊和椭圆囊——以重叠的方式投射到尾侧前核的背侧半，对吻侧前核的投射极少。耳石终器对下行核中间区的输入更为分散，不过特定区域有时由不止一个终器提供输入。球囊的投射往往比其他两个终器的投射更集中于内侧。下行核的背内侧区在其大部分前后范围内，主要输入来自球囊，来自瓶状囊的输入则少得多。在背内侧区的最尾端水平，来自三个耳石终器的传入纤维相互重叠。
