Phylogenetic changes in the connections of the lateral preglomerular nucleus in ostariophysan teleosts: a pluralistic view of brain evolution.
Phylogenetic changes in the connections of the lateral preglomerular nucleus in ostariophysan teleosts: a pluralistic view of brain evolution.
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硬骨鱼外侧前肾小球核连接的系统发育变化：大脑进化的多元观点。
DOI：
10.1159/000114130
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Striedter,GF
中科院分区：
文献类型：
--
作者：
Striedter,GF
用荧光示踪剂 DiI 检查了鲤鱼、鲹鱼、鲶鱼和裸鱼物种的肾小球外侧核的连接。在所有这些类群中，外侧前肾小球核接收来自半圆环的输入并投射到端脑。细胞结构和拓扑数据进一步支持了以下假设：所检查的物种中外侧前肾小球核是同源的。然而，对物种差异的分支分析表明，外侧前肾小球核的某些连接在进化过程中发生了巨大变化。一些与外侧肾小球前核相互连接的细胞群尺寸增大，而另一些细胞群尺寸减小。细胞群细分数量的增加通常与尺寸的增加相关，但也可能与尺寸的减小相关。细胞群之间的一些连接强度增加，而另一些连接强度下降，但这些连接变化与细胞群大小的系统发育变化没有简单的关系。细胞群内细分数量的系统发育增加可能与连接的选择性增加有关，但也可能与连接的选择性丢失或连接没有重大变化有关。此外，一些细胞群和连接似乎是“从头”进化的，而其他细胞群和连接在进化过程中已经消失。最后，这一相互连接的细胞核系统中的各个细胞群在很大程度上彼此独立地发生了变化。这些发现证实大脑进化并不是由单一类型的系统发育变化主导。
The connections of the lateral preglomerular nucleus were examined wjth the fluorescent tracer DiI in a cyprinid, a characin, a catfish and a gymnotoid species. In all of these taxa the lateral preglomerular nucleus receives inputs from the torus semicircularis and projects to the telencephalon. Cytoarchitectural and topological data further support the hypothesis that the lateral preglomerular nucleus is homologous among the species examined. A cladistic analysis of species differences, however, reveals that some connections of the lateral preglomerular nucleus have changed dramatically during the course of evolution. Some of the cell groups that are interconnected with the lateral preglomerular nucleus have increased in size, while others have decreased. Increases in the number of subdivisions of cell groups are frequently associated with size increases, but they may also be associated with size decreases. Some of the connections between cell groups have increased in strength, whereas others have decreased in strength, but these connectional changes bear no simple relationship to phylogenetic changes in the size of the cell groups. Phylogenetic increases in the number of subdivisions within a cell group may be associated with selective gains of connections, but they may be associated also with selective losses of connections or with no major changes in connections. Furthermore, several cell groups and connections appear to have evolved 'de novo', whereas others have disappeared during the course of evolution. Finally, the individual cell groups within this system of interconnected nuclei have changed largely independently of one another. These findings establish that brain evolution is not dominated by a single type of phylogenetic change.