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The neurnios are the responsible cells for the transmission of the nervous impulse in the animals. This is endowed with carcter electrochemical, for if considering that its transmission if processes electrically throughout the nervous cell, but chemically of neurnio for neurnio. The concept of sinapse to define the communication, strict of physiological nature is used, between two consecutive nervous cells, pondering the inexistence of an effective physical contact between two consecutive neurnios. Thus, in the membrane of axnio, in the region of telodendro, called membrane daily pay-sinptica, neurotransmitters are become free that, a time in the sinptica crack, stimulate the membrane of the dendrite of the following neurnio, that is, the membrane after-sinptica. By consequncia, in this neurnio, to the level of the membrane, its permeability to the caties is modified sodium and potassium. This alteration is expressed an inversion of the membrane potential that characterizes these cells in situation of rest, varying of – 70 mV for + 40 mV. In such a way, regista the development of a share potential that if propagates throughout the nervous cell, transmitting thus the impulse nervous.