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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.
Electrochemical events in the cell body summate in the axon hillock, and the effects are directly passed to the attached axon. If an action potential is generated, the axon conducts it away from the cell body. The axon attaches directly to the dendrites in many neurons. In this arrangement, the axon conducts action potentials toward the cell body.