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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.
Myelinated/Medullated neuron: The neuron whose axon is covered by myelin sheath (myelin means white) is called myelinated neuron. The conduction of nerve impulse is faster in this neuron than non-myelinated neuron due to presence of myelin sheath over the axon.