The sodium channels are concentrated at nodes of Ranvier. Electron microscopy shows a dense layer on the axonal face of the axolemma (Fig. 2.5B). Channel packing density at the node is about 1500/sq micron, about 25 times higher than in the internode. In the nodal region, the Schwann ce...
(redirected from node of Ranvier gaps)Also found in: Thesaurus, Medical, Encyclopedia. node (nōd) n. 1. a. A knob, knot, protuberance, or swelling. b. Medicine A small, well-defined mass of tissue that is either normal or pathological, as a lymph node or a node at an arthritic...
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Schematic diagram showing the different domains of a myelinated neuron. The axonal region around the node of Ranvier is expanded to show the different axonal domains: the node of Ranvier where voltage-gated Na+channels are expressed, the paranode where the myelin is attached to the axon, and ...
9.either of the two points at which the orbit of a heavenly body intersects a given plane, esp. the plane of the ecliptic or of the celestial equator. 10.a labeled point in a tree diagram at which subordinate lines branch off.