Two visual systems in one brain: neuropils serving the secondary eyes of the spider Cupiennius salei.
Two visual systems in one brain: neuropils serving the secondary eyes of the spider Cupiennius salei.
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一个大脑中有两个视觉系统：神经细胞服务于蜘蛛 Cupiennius salei 的副眼。
DOI：
10.1002/cne.903280104
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Barth,FG
中科院分区：
文献类型：
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作者：
Strausfeld,NJ;Barth,FG
与其他蜘蛛一样，游走蜘蛛Cupiennius saleiis也配备有一对主眼和三对副眼。主眼和副眼服务于大脑中两组不同的视觉神经细胞。本文描述了由副眼提供的神经纤维中的细胞组织，副眼将轴突分别发送到三个与它们同名的昆虫叠加眼相似的薄片中。次级眼光感受器将轴突发送到小视场投射神经元（L细胞），这些神经元从每个层延伸出来以供应三个独立的髓质。每个髓质都是一个神经纤维穹窿，仅包含几种形态类型的神经元。这些可以与双翅目的髓质中的视网膜专题神经元的子集进行比较，这些神经元在小叶板中提供巨大的运动敏感神经元。在Cupiennius中，来自次级眼髓质的神经元聚集在一个称为“蘑菇体”的单一目标神经元处。该区域包含巨大的输出神经元，与小叶板中的对应神经元一样，它们通向供给胸部运动回路的下行通路。有人认为，为库平尼乌斯的第二只眼睛服务的细胞排列是专门用于检测水平运动的与颜色无关的通路。目前的结果并不支持蜘蛛“蘑菇体”与昆虫中的同名蜘蛛在系统发育上同源或功能相似的经典观点。 © 1993 Wiley-Liss, Inc.
Like other araneans, the wandering spiderCupiennius saleiis equipped with one pair of principal eyes and three pairs of secondary eyes. Primary and secondary eyes serve two distinct sets of visual neuropils in the brain. This paper describes cellular organization in neuropils supplied by the secondary eyes, which individually send axons into three laminas resembling their namesakes serving insect superposition eyes. Secondary eye photoreceptors send axons to small‐field projection neurons (L‐cells) which extend from each lamina to supply three separate medullas. Each medulla is a vault of neuropil comprising only a few morphological types of neurons. These can be compared to a subset of retinotopic neurons in the medullas of calliphorid Diptera supplying giant motion‐sensitive neurons in the lobula plate. InCupiennius, neurons from secondary eye medullas converge at a single target neuropil called the “mushroom body.” This region contains giant output neurons which, like their counterparts in the calliphorid lobula plate, lead to descending pathways that supply thoracic motor circuits. It is suggested that the cellular arrangements servingCupiennius'ssecondary eyes are color independent pathways specialized for detecting horizontal motion. The present results do not support the classical view that the spider “mushroom body” is phylogenetically homologous or functionally analogous to its namesake in insects. © 1993 Wiley‐Liss, Inc.