Saltatory conduction occurs in

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(A) The myelin sheath of myelinated nerve fibres prevents the flow of ions between the extracellular fluid and the axoplasm.Exchange of ions can occur

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Myelinated nerve fibres

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(A) The myelin sheath of myelinated nerve fibres prevents the flow of ions between the extracellular fluid and the axoplasm.Exchange of ions can occur only at the nodes of $Ranvier$.Therefore,the action potential jumps from node to node and passes along the myelinated axon faster than the series of smaller local currents in a non-myelinated axon.This process is called saltatory conduction.

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