node of Ranvier [ˌnəʊdɒvˈrɒnveɑ] СЪЩ
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- Ranvier-Schnürring
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Each node of Ranvier is flanked by paranodal regions where helicoidally wrapped glial loops are attached to the axonal membrane by a septate-like junction.
en.wikipedia.org However, the current is carried by the cytoplasm, which is sufficient to depolarize the first or second subsequent node of Ranvier.
en.wikipedia.org The action potential only moves in one direction, because the sodium channels at the previous node of Ranvier are inactivated, and can not regenerate another action potential, even when depolarized.
en.wikipedia.org The charge will passively depolarize the adjacent node of Ranvier to threshold, triggering an action potential in this region and subsequently depolarizing the next node, and so on.
en.wikipedia.org Therefore, at the point of the node of Ranvier, the axon is reduced in diameter.
en.wikipedia.org