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首页> 外文期刊>Russian journal of marine biology >Microscopic Anatomy and Ultrastructure of the Nervous System of Phoronopsis harmeri Pixell, 1912 (Lophophorata: Phoronida)
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Microscopic Anatomy and Ultrastructure of the Nervous System of Phoronopsis harmeri Pixell, 1912 (Lophophorata: Phoronida)

机译：斑秃皮盒神经系统的显微解剖学和超微结构，1912年（Lophophorata：Phoronida）

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摘要

The microscopic anatomy and ultrastructure of the nervous system of Phoronopsis harmeri was investigated using histological techniques and electron microscopy. The collar nerve ring is basically formed by circular nerve fibers originating from sensitive cells of tentacles. The dorsal nerve plexus principally consists of large motor neurons. It is shown for the first time that the sensitive collar nerve ring immediately passes into the motor dorsal nerve plexus. The basic components of the nervous system have similar cytoarchitectonics and a layered structure. The first layer is formed by numerous nerve fibers surrounded by the processes of glia-like cells. The bodies of glia-like cells constitute the second layer. The third layer consists of neuron bodies overarched by the bodies of epidermal cells. The giant nervous fiber is accompanied by more than one hundred nerve fibers of a common structure and, thus, marks the true longitudinal nerve. The phoronids possess one or two longitudinal nerves. It is supposed that the plexus nature of the nervous system in phoronids may be related to their phylogenesis. A comparison of the nervous system organization and body plans among the Lophophorata suggests that the nervous system of phoronids cannot be considered as a reductive variant of the brachiopod nervous system. At the same time, the structure of the nervous system of bryozoans can be derived from that of phoronids.
机译：利用组织学技术和电子显微镜研究了海豚毛虫神经系统的显微解剖和超微结构。颈神经环基本上由源自触角敏感细胞的环形神经纤维形成。背神经丛主要由大型运动神经元组成。首次显示敏感的颈神经环立即进入运动背神经丛。神经系统的基本组成部分具有相似的细胞结构学和分层结构。第一层由被神经胶质样细胞的过程包围的大量神经纤维形成。胶质样细胞的主体构成第二层。第三层由被表皮细胞体覆盖的神经元体组成。巨大的神经纤维伴有一百多条结构相同的神经纤维，因此标志着真正的纵神经。蛇骨拥有一或两个纵向神经。据推测，类人鱼的神经系统的神经丛性质可能与其系统发育有关。麦草的神经系统组织和身体计划的比较表明，鱼骨类的神经系统不能被认为是腕足动物神经系统的还原性变体。同时，苔藓动物的神经系统结构可以衍生自蛇骨类。

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