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NODES OF RANVIER (Three) in MYELINATED NERVE FIBERS in a NERVE, they promote SALTATORY CONDUCTION of the NERVE IMPULSE, 250X. The Nodes of Ranvier appear as constrictions in the MYELIN SHEATH. The nerve fiber is reddish and the myelin sheath is the white space surrounding the fiber. The Nodes of Ranvier are uninsulated areas with many ion channels. They promote SALTATORY ("JUMPING") CONDUCTION of the nerve impulse were the nerve impulse seems to jump from node to node instead of the continuous conduction in unmyelinated nerve fibers. Conduction is much faster in these myelinated fibers with nodes of ranvier. This image is a longitudinal section of the nerve and nerve fibers.