On the areas of the axis cylinder and medullary sheath as seen in cross sections of the spinal nerves of vertebrates.
On the areas of the axis cylinder and medullary sheath as seen in cross sections of the spinal nerves of vertebrates.
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DOI：
10.1002/cne.920150102
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发表时间：
1905-01-01
影响因子：
--
通讯作者：
Hoke, GW
中科院分区：
文献类型：
--
作者：
Donaldson, HH;Hoke, GW
介绍。在每种情况下，本文提供的结果都基于二十根或更多脊髓神经纤维测量的平均值。这些神经取自代表五大类脊椎动物的各种动物。测量表明，髓鞘和封闭轴的面积几乎相等，因此，形成轴圆柱体的物质的体积等于形成髓鞘的物质的体积。这种关系构成了一个相似点，因为它在脊椎动物系列中的广泛延伸而引人注目。“它使我们能够，此外，估计在任何神经中专门用于传导神经冲动的物质的体积。由于轴柱和鞘之间的这种定量关系是如此密切，这强烈地表明轴在某种程度上控制着周围髓质物质的形成。在某些动物的脊神经中，这种关系在几年前就已被指出，正如在横截面上观察纤维时，轴和鞘的面积相等所表示的那样
Introduction.-The results presented in this paper are, in each case, based on averages of the measurements of twenty or more spinal nerve fibers. The nerves were taken from various animals representing the five great classes of vertebrates. The measurements show that the areas of the medullary sheath and enclosed axis are nearly equal, and by consequence that the volume of the substance forming the axis cylinders is equal to that forming the medullary sheaths. The relation constitutes a point of similarity remarkable for its wide extension through the vertebrate series.'It enables us, moreover, to estimate in any nerve the volunie of the substance specialized for the conductio, i of the nerve impulse. Since this quantitative relation between axis cylinder and sheath is so close, it strongly suggests that in some way the axis controls the formation of the surrounding medullary substance. In the spinal nerves of some animals this relation, as expressed by the equal areas of the axis and sheath when the fibers are seen in the cross section, was pointed out several years ago