The diencephalon of the channel catfish, Ictalurus punctatus. I. Nuclear organization.
The diencephalon of the channel catfish, Ictalurus punctatus. I. Nuclear organization.
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斑点叉尾鮰的间脑。
DOI：
10.1159/000115318
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发表时间：
1990
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
对斑点叉尾鮰间脑的详细细胞结构描述揭示了 40 多个不同的细胞群。其中，4个位于视前区，8个位于下丘脑，7个位于丘脑，2个位于上丘脑，15个位于后结节，7个位于联脑。之前描述过的斑点叉尾鱼的间脑与金鱼的间脑的比较表明，这两个物种之间的间脑存在重大差异。斑点叉尾鮰缺乏金鱼的浅表前盖层和“肾小球”核，而斑点鲶的下丘脑前结节核、联脑旁连合核和后结节的叶球核都比金鱼发达。斑点叉尾鮰的同脑中的电感觉核可能与裸齿硬骨鱼中的同名核同源，但在金鱼的间脑中似乎没有同源物。对鲶鱼、金鱼和其他几种硬骨鱼间脑的种间变异的分析表明，间脑的某些区域在不同物种之间的变异性比其他区域更大。具体来说，后结节和联脑的迁移部分似乎变化最大，而上丘脑和视前区则是最保守的。据推测，相对保守的大脑区域可能比变化较大的区域具有更多数量的传入和传出连接，并且可能还具有更多数量的不同行为功能。
A detailed cytoarchitectonic description of the diencephalon in the channel catfish reveals more than 40 distinct cell groups. Of these, 4 are located in the preoptic area, 8 in the hypothalamus, 7 in the thalamus, 2 in the epithalamus, 15 in the posterior tuberculum and 7 in the synencephalon. A comparison of the diencephalon ofIctalurus punctatusto that of goldfish, which has previously been described, indicates major differences in the diencephalon between these two species. Channel catfish lack the superficial pretectum and the nucleus 'glomerulosus' of goldfish, whereas the anterior tuberal nucleus of the hypothalamus, the paracommissural nucleus of the synencephalon and the nucleus lobobulbaris of the posterior tuberculum are all better developed in channel catfish than in goldfish. The nucleus electrosensorius in the synencephalon of channel catfish is probably homologous to the nucleus of the same name in gymnotoid teleosts, but it appears to have no homologue in the diencephalon of goldfish. An analysis of interspecific variation in the diencephalon among catfishes, goldfish and several other teleosts reveals that some areas of the diencephalon are more variable across species than others. Specifically, the migrated portions of both the posterior tuberculum and the synencephalon appear to be most variable, whereas the epithalamus and the preoptic area are the most conservative. It is hypothesized that the relatively conservative areas of the brain may have a greater number of afferent and efferent connections, and probably also a greater number of distinct behavioral functions, than the more variable areas.