在两段髓鞘之间是无髓鞘的部分,称为郎飞氏结(node of Ranvier),其电阻要比结间小得多。因此,在冲动传导时,局部电流可由一个郎飞氏结跳跃到邻近的下一个郎飞氏结。
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N any of the gaps that occur at regular intervals along the length of the sheath of a myelinated nerve fibre, at which the axon is exposed 郎维结; 髓神经纤维绞扼所致的小结
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