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Lesia Marie. A nerve impulse is an electrical charge that travels down the cell membrane of a neuron's dendrite and/or axon through the action of the Na-K pump. The inside of a neuron's cell membrane is negatively-charged while the outside is positively-charged. It is called Action potential.
The conduction of the neural impulse in a myelinated axon is called saltatory conduction, and combines electrotonic conduction (underneath the Schwann or Oligodendrocyte glial cells which myelinate the axon), with the action potential which occurs just in the gaps between the glial cells.here are a couple of things that happen during saltatory  conduction. The main thing is action potentials being propagated  from one node of Ranvier to the next node along â¦ the myelinated  axons.