翻訳と辞書 Words near each other ・ Node (band) ・ Node (circuits) ・ Node (computer science) ・ Node (networking) ・ Node (physics) ・ Node (UML) ・ Node (Well of Echoes) ・ NODE (wireless sensor) ・ Node 4 ・ Node B ・ Node deletion ・ Node graph architecture ・ Node influence metric ・ Node Magazine ・ Node module ・ Node of Ranvier ・ Node stream ・ Node tribe ・ Node, Kentucky ・ Node-RED ・ Node-to-node data transfer ・ Node.Hack ・ Node.js ・ Nodec space ・ Nodeclipse ・ Nodefly ・ Nodejitsu ・ Nodeland ・ Nodeland Station ・ Nodelandsheia Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Node of Ranvier ： ウィキペディア英語版 Node of Ranvier Nodes of Ranvier, also known as myelin sheath gaps, are periodic gaps in the insulating myelin sheaths of myelinated axons where the axonal membrane is exposed to the extracellular space. Nodes of Ranvier are uninsulated and highly enriched in ion channels, allowing them to participate in the exchange of ions required to regenerate the action potential. Nerve conduction in myelinated axons is referred to as saltatory conduction (from the Latin ''saltare'', to hop or leap) because of the manner in which the action potential seems to "jump" from one node to the next along the length of the axon. ==Overview== Many vertebrate axons are surrounded by a myelin sheath, allowing rapid and efficient saltatory ("jumping") propagation of action potentials. The contacts between neurons and glial cells display a very high level of spatial and temporal organization in myelinated fibers. The myelinating glial cells; oligodendrocytes in the central nervous system (CNS), and Schwann cells in the peripheral nervous system (PNS), are wrapped around the axon, leaving the axolemma relatively uncovered at regularly spaced nodes of Ranvier. The internodal glial membranes are fused to form compact myelin, whereas the cytoplasm-filled paranodal loops of myelinating cells are spirally rolled up around the axon at both sides of the nodes. This organization demands a tight developmental control and the formation of a variety of specialized zones of contact between different areas of the myelinating cell membrane. 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. The segment between nodes of Ranvier is termed as the internode, and its outermost part that is in contact with paranodes is referred to as the juxtaparanodal region. The nodes are encapsulated by microvilli stemming from the outer aspect of the Schwann cell membrane in the PNS, or by perinodal extensions from astrocytes in the CNS. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Node of Ranvier」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.