Connections of the pallial telencephalon in the Senegal bichir, Polypterus
Connections of the pallial telencephalon in the Senegal bichir, Polypterus
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DOI：
10.1159/000069750
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发表时间：
2003-01-01
影响因子：
1.7
通讯作者：
Northcutt, RG
中科院分区：
文献类型：
--
作者：
Holmes, PH;Northcutt, RG
研究了塞内加尔多鳍鱼（Polypterus senephirus）端脑背侧的连接，以验证多鳍鱼简单外翻的端脑与大多数脊椎动物外翻的端脑直接相似的假说。神经解剖示踪剂（Dil或生物素化葡聚糖胺）被注射到三个传统上公认的部门的bichir pallium，以确定其传入和传出连接。这些连接通过注射到被确定为投射到一个或多个苍白球分区或从一个或多个苍白球分区接收输入的区域来证实。结果表明，bichir腭骨包括不是三个，但只有两个主要部分：背内侧和背外侧之一。这一重新解释驳斥了与大多数脊椎动物的三重颚直接一对一比较的假设。在无尾两栖动物的外侧和内侧腭骨中分别发现了bichir背内侧腭骨和背外侧腭骨的同源物。将双鳍鱼的鳍骨与衍生鳍鱼的鳍骨进行比较，作为衍生鳍鱼与其他脊椎动物之间的联系。硬骨鱼类软腭连接的现有信息表明，只有嗅觉受体（部后）的软腭可以直接比较bichirs和两栖动物和硬骨鱼类的软腭的其余部门是唯一的硬骨鱼端脑衍生功能。
The connections of the dorsal telencephalon (pallium) of the Senegal bichir (Polypterus senegalus) were investigated in order to test the hypothesis that the simple everted pallium of polypterid fishes is directly comparable to the evaginated pallium of most vertebrates. Neuroanatomical tracers (Dil or biotinylinated dextran amines) were injected into the three traditionally recognized divisions of the bichir pallium to determine their afferent and efferent connections. The connections were corroborated with injections into regions identified as projecting to, or receiving input from, one or more pallial divisions. The results suggest that the bichir pallium consists not of three, but only two primary divisions: a dorsomedial one and a dorsolateral one. This reinterpretation refutes the hypothesis of a direct one-to-one comparison with the tripartite pallium of most vertebrates. Homologues of the bichir dorsomedial and dorsolateral pallium are recognized in the lateral and medial pallium of anuran amphibians, respectively. The pallium of bichirs is compared to that of derived ray-finned fishes as a link between derived ray-finned fishes and other vertebrates. The available information on the connections of the pallium of teleosts suggests that only the olfactory recipient (pars posterior) of the pallium can be directly compared to bichirs and amphibians and that the remaining divisions of the pallium in teleosts are uniquely derived features of the teleost telencephalon.