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首页> 外文期刊>Cell and Tissue Research >The ring nerve of the box jellyfish Tripedalia cystophora
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The ring nerve of the box jellyfish Tripedalia cystophora

机译：盒子水母Tripedalia cystophora的环神经

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Box jellyfish have the most elaborate sensory system and behavioural repertoire of all cnidarians. Sensory input largely comes from 24 eyes situated on four club-shaped sensory structures, the rhopalia, and behaviour includes obstacle avoidance, light shaft attractance and mating. To process the sensory input and convert it into the appropriate behaviour, the box jellyfish have a central nervous system (CNS) but this is still poorly understood. The CNS has two major components: the rhopalial nervous system and the ring nerve. The rhopalial nervous system is situated within the rhopalia in close connection with the eyes, whereas the ring nerve encircles the bell. We describe the morphology of the ring nerve of the box jellyfish Tripedalia cystophora as ascertained by normal histological techniques, immunohistochemistry and transmission electron microscopy. By light microscopy, we have estimated the number of cells in the ring nerve by counting their nuclei. In cross sections at the ultrastructural level, the ring nerve appears to have three types of neurites: (1) small “normal”-looking neurites, (2) medium-sized neurites almost completely filled by electron-lucent vacuoles and (3) giant neurites. In general, only one giant neurite is seen on each section; this type displays the most synapses. Epithelial cells divide the ring nerve into compartments, each having a tendency to contain neurites of similar morphology. The number and arrangement of the compartments vary along the length of the ring nerve.
机译：盒装水母在所有cnidarians中拥有最完善的感觉系统和行为功能。感官输入主要来自位于四个棍状感官结构（纹状体）上的24只眼睛，行为包括避开障碍物，光轴引力和交配。为了处理感官输入并将其转换为适当的行为，盒装水母具有中枢神经系统（CNS），但对此知之甚少。中枢神经系统有两个主要组成部分：纹状神经系统和环神经。纹状体神经系统位于纹状体内部，与眼睛紧密相连，而环形神经环绕铃铛。我们描述了通过正常的组织学技术，免疫组织化学和透射电镜确定的盒状水母Tripedalia cystophora的环神经的形态。通过光学显微镜，我们通过计数细胞核来估计环形神经中的细胞数量。在超微结构水平的横截面中，环形神经似乎具有三种类型的神经突：（1）小的“正常”外观神经突；（2）中型神经突几乎完全被电子透明液泡填充；（3）巨大的神经突神经突。通常，在每个部分只能看到一个巨大的神经突。这种类型的突触最多。上皮细胞将环神经划分为多个区室，每个区室都倾向于包含形态相似的神经突。隔室的数量和布置沿环形神经的长度变化。

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