The Central Nervous System in Larval Acraniates
The Central Nervous System in Larval Acraniates
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幼虫的中枢神经系统
DOI：
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发表时间：
1959
期刊：
影响因子：
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通讯作者：
Q. Bone
中科院分区：
文献类型：
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作者：
Q. Bone
本文描述了Acrania幼虫脊髓组织的一部分，主要涉及那些可能与游泳模式控制有关的束和细胞群。这些观察结果是将幼虫的索组织与成虫的索组织以及已知的无颌类和高等脊椎动物的幼虫的索组织进行比较的基础。其他的观察与周围神经系统的排列有关，它在某些方面与成人的不同。第一节讨论的是脊髓中纤维束的排列，以及产生这些纤维的细胞体的排列。巨细胞的形式和连接，然后描述，它表明，这些细胞是相当于脊椎动物胚胎的Rohon-Beard感觉细胞。它们通过背根神经发出外周突起，但它们与脊椎动物感觉神经元的区别在于它们的树突区和脊髓中的纵向轴突大大扩大。第三，描述了鳃肌的神经支配。发现腹外侧不对称神经，由右前背根神经的纤维连接形成。最后，整个系统的安排进行了讨论，在其他原始脊索动物的幼虫阶段发现的系统。
This paper describes a part of the organization of the spinal cord of the larva of the Acrania, dealing chiefly with those tracts and cell groups that are probably concerned with the control of the swimming pattern. These observations serve as a basis for the comparison of the organization of the cord of the larva with that of the adult, and with that known for the larvae of the Agnatha and higher vertebrates. Other observations are concerned with the arrangement of the peripheral nervous system, which differs in some respects from that of the adult. The first section deals with the arrangement of the fibre tracts in the cord, and of the cell-bodies which give rise to these fibres. The form and connexions of the giant cells are then described; it is shown that these cells are equivalent to the Rohon-Beard sensory cells of vertebrate embryos. They send peripheral processes out through dorsal root nerves, but they differ from the vertebrate sensory neurones in their greatly enlarged dendrite field and the longitudinal axon in the cord. Thirdly, the innervation of the gill musculature is described. A ventro-lateral asymmetrical nerve is found, formed by the junction of fibres from the right anterior dorsal root nerves. Lastly, the arrangement of the whole system is discussed in relation to the systems found in the larval stages of other primitive chordates.