The cell membrane of the axon and soma contain voltage-gated ion channels that allow the neuron to generate and propagate an electrical signal an action potential. The action potential transfers to synapsed Nervous system neurons that connect to the optic nerve. Neurons in the adult brain generally do not undergo cell division. All neurons are electrically excitable, due to maintenance of voltage gradients across their membranes Pics pussy girl means of metabolically driven ion pumpswhich combine with Nervous system neurons channels embedded Nervous system neurons the membrane to generate intracellular-versus-extracellular concentration differences of ions such as sodiumpotassiumchlorideand calcium. Impulse conduction - an impulse is simply the movement of action potentials along a nerve cell. The sodium channels open only briefly, then close again.