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Neural network. Artwork of several nerve cells (neurons) forming a neural network. Neurons are responsible for passing information around the central nervous system (CNS, brain and spinal cord) and from the CNS to the rest of the body. This information is transmitted as electrical impulses (white flashes). A nerve cell comprises a central nerve cell body surrounded by numerous extensions (dendrites) and an axon (thicker, myelinated), through which information passes outwards to other cells, including other nerve cells and muscle fibres. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHRISTIAN KOCH, MICROCHEMICALS/SCIENCE PHOTO LIBRARY)