Nodes of Ranvier
Nodes of Ranvier are gaps in myelin coverage along axons. Nodes contain voltage-gated K+ and Na+ channels. Action potentials travel down the axon by jumping from one node to the next.
Source
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"OpenStax College, How Neurons Communicate. October 17, 2013."
http://cnx.org/content/m44748/latest/Figure_35_02_05.jpg
OpenStax CNX
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