Neuronal connectivity patterns in the compound eyes of Artemia salina and Daphnia magna (Crustacea: Branchiopoda)
Neuronal connectivity patterns in the compound eyes of Artemia salina and Daphnia magna (Crustacea: Branchiopoda)
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卤虫和大型溞（甲壳纲：鳃足纲）复眼的神经元连接模式
DOI：
10.1007/bf00219557
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发表时间：
1978
影响因子：
3.6
通讯作者：
R. Odselius
中科院分区：
文献类型：
--
作者：
D. Nässel;R. Elofsson;R. Odselius
用高尔基体法和电镜技术研究了卤虫和大型蚤视觉系统神经元的类型和模式。板层包含五类神经元：光感受器轴突、单极、离心、切向和无长突神经元。感受器轴突终末分布于两个（A. salina）或3个（D. magna）层。扩张的终端有广泛和广泛的细分支。A.每个小眼有一个轴突绕过板层，终止于髓质。salina。A. salina有四种类型的单极神经元，其中两种是分层的，而D. magna仅发现两种类型，其中一种是双层的。切向T神经元连接板层和前脑。D.此外，小脑大还具有一个切向T神经元，将板层和髓质与前脑连接起来。在这两个物种的单极型离心神经元连接髓质和板层，而A。盐沼有广泛的层状分布。这两个物种也有无长突细胞在椎板。髓质除了与板层共有的神经元外，还含有穿髓神经元（A.无长突细胞和起源于前脑的神经元。在所研究的物种中缺乏“盒”型突触室，尽管在A的板层的远端部分可辨别出周期性排列。salina。卤虫的受体来自三种类型的专门接触，其中之一涉及二分体。D.大脑只有一对一的突触神经分泌纤维在A. salina。
SummaryThe neuronal types and patterns in the visual system of the species Artemia salina and Daphina magna have been studied with the Golgi method and electron microscopy. The lamina contains five classes of neurons: photoreceptor axons, monopolar, centrifugal, tangential and amacrine neurons. The terminals of the receptor axons are distributed in two (A. salina) or three (D. magna) layers. The dilated terminals have an extensive and wide array of fine branches. One axon from each ommatidium bypasses the lamina and terminates in the medulla in A. salina. A. salina has four types of monopolar neurons, two of which are stratified, whereas in D. magna only two types are found, one of which is bistratified. Tangential T-neurons connect the lamina with the protocerebrum. D. magna has in addition one tangential T-neuron connecting both the lamina and the medulla with the protocerebrum. In both species monopolar-type centrifugal neurons connect the medulla and the lamina, whereas that of A. salina has a wide laminar distribution. Both species also have amacrine cells in the lamina. The medulla contains, besides those shared with the lamina, transmedullary neurons (two types in A. salina), amacrine cells and neurons originating in the protocerebrum.“Cartridge”-type synaptic compartments are lacking in the investigated species, although a periodic arrangement is discernible in the distal portion of the lamina of A. salina. The receptors from three types of specialized contacts in Artemia, one of which involves a dyad. D. magna has only one-to-one synapses. Neurosecretory fibres are absent in A. salina.