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Nervous system (NS) in worms 550-600 million years ago. In vertebrates NS: brain and spinal cord connected to the body by peripheral NS. Neuron, sends electrochemical waves along axons, releasing neurotransmitters at synapses, hundred cells in worms, 100 billion in humans. Bioelectrical and chemical synapses originate action potential in sensory, motor, interneurons. Glial cells: nutrition, form myelin. Electrical synapses abundant in NS. Purkinje cells receive 200,000 synapses from 200 million mossy fiber expanded to 40 billion granule cells that go to 15 million Purkinje cells. The reticular formation in brainstem enables consciousness, sensory motor function and neurotransmitter regulation, receives 100 million impulses every second. An electric current inside a wire creates a magnetic field outside the wire. The electromagnetic force is a fundamental force. Light is an electromagnetic wave. Na+ activation, Na+ inactivation, K+ activation creates the nerve impulse. Active transport is due to the sodium-potassium pump. Retina used as model for NS defined completely with more than 7,750 electron-micrographs. Prion protein in neuron membranes at highest levels in brain spinal cord.