However, the myelin insulation does not cover the entire axon. Rather there are breaks in the wrapping. These breaks are called nodes of Ranvier. The distance between these nodes is between 0.2 and 2 mm. Action potentials traveling down the axon "jump" from node to node. This is called saltatory conduction which means "to leap". Saltatory conduction is a faster way to travel down an axon than traveling in an axon without myelin.

Animated graphicofsaltatory conduction.