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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.
axon. the process of a nerve cell along which impulses travel away from the cell body. It branches at its termination, forming synapses at other nerve cells or effector organs. Many axons are covered by a myelin sheath formed from the cell membrane of a glial or Schwann cell. axon hillock. the elevation on the perikaryon from which the axon emerges. axon reflex. a nerve impulse conducted through nerve pathways limited to the single axon, without the participation of a nerve cell or synapse. Not a true reflex. axon telodendrion. extensive terminal branches of the axon before terminating on the effector organ.