NERVE FIBRES IN OPTIC NERVE OF RAT
NERVE FIBRES IN OPTIC NERVE OF RAT
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DOI：
10.1038/214245a0
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发表时间：
1967-01-01
期刊：
影响因子：
64.8
通讯作者：
PETERS, A
中科院分区：
文献类型：
--
作者：
FORRESTER, J;PETERS, A
大鼠视神经的纤维总数约为11.7万根；计算出这两条神经的数目分别为11.63万根和11.83万根。它们都是有髓鞘的。极少数(0.18%)的纤维没有髓鞘，可以通过假设它们是在Ranvier结节处被切断来解释。这一假设得到了轴膜下电子致密颗粒状物质的支持，这是兰维尔节处轴突的特征。所有观察到的结节纤维直径都很小(小于0.8[mU])，因此，要么在电子显微镜下观察到的神经中存在的较大的有髓纤维在结节处没有被切断，要么这些较大的纤维在结节处变得比它们之间的过程变窄。
The total number of fibers in the rat optic nerve is about 117,000; the numbers calculated for the 2 nerves are 116,300 and 118,300. They are all myelinated. The very small number (0.18%) of fibers seen to have no myelin sheath can be accounted for by assuming that they were cut at the node of Ranvier. This assumption is supported by the presence of electron dense granular material beneath the axolemma, which is a characteristic of an axon at a node of Ranvier. All the nodal fibers observed were of small diameter (less than 0.8[mu]), so that either none of the larger myelinated fibers present in the nerve was cut at a node in the present sections examined by electron microscopy, or else these larger fibers became narrower at a node than in their intervening course.