Axogenesis in the stomatopod crustacean Gonodactylaceus falcatus (Malacostraca)
Axogenesis in the stomatopod crustacean Gonodactylaceus falcatus (Malacostraca)
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DOI：
10.1111/j.1744-7410.2010.00192.x
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发表时间：
2010-01-01
影响因子：
1.2
通讯作者：
Scholtz, Gerhard
中科院分区：
文献类型：
--
作者：
Fischer, Antje H. L.;Scholtz, Gerhard
本文用突触素和α-微管蛋白抗体染色的方法，描述了口足类甲壳动物镰刀鱼中枢神经系统的形成。结果表明，腹侧神经系统的纵向纤维束由两个起源中心组成，其中一个位于形成脑的后部，另一个位于胚胎最后部的端突区域。除结缔组织的侧支外，正中纵神经始于下颌段神经节。与其他节段不同的是，下颌神经节由单一的连合连接。大脑形成一个环状结构。有证据表明，中脑有去顶前纤维和吻合后连合纤维。无节幼虫眼的原基显示了一种特殊的色素和感觉细胞模式，这两种色素细胞表达突触素。突触素和α-微管蛋白表达模式的明显差异建议结合各种抗体来获得胚胎神经解剖学的完整图景。我们的结果显示，总体上与其他软体动物和非软体动物的甲壳类相似。与其他甲壳类和节肢动物的比较表明，甲壳类无节幼体的眼睛、口周中脑以及形成腹侧中枢神经系统轴突支架的后脑前驱神经元的同源性比之前认为的更广泛。
The formation of the central nervous system of the stomatopod crustacean Gonodactylaceus falcatus is described by means of antibody stainings against synapsin and alpha-tubulin. It is shown that the longitudinal fiber tracts of the ventral nervous system are formed by two centers of origin comprising a number of pioneer neurons, one at the posterior part of the forming brain, the other in the area of the telson anlage at the posteriormost region of the embryo. In addition to the lateral anlagen of the connectives, a median longitudinal nerve is formed beginning in the mandibular segment neuromere. In contrast to those of other segments, the mandibular ganglia are connected by a single commissure. The brain forms a circumoral ring. There is evidence that the deutocerebrum possesses praestomodeal and poststomodeal commissural fibers. The anlage of the nauplius eye reveals a specific pattern of pigment and sensory cells with the two pigment cells expressing synapsin. Clear differences between the expression patterns of synapsin and alpha-tubulin recommend the combination of a variety of antibodies to gain a complete picture of embryonic neuroanatomy. Our results show overall similarities to other malacostracan and non-malacostracan crustaceans. The comparisons with other crustaceans and arthropods indicate homology of crustacean nauplius eyes, a circumoral deutocerebrum, and a more widespread occurrence of posterior pioneer neurons forming the axon scaffold of the ventral central nervous system than previously thought.