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Brain cells and fibres, light micrograph. Neural staining of nerve cells (neurons) and their fibres in the brain. A nerve cell comprises a central nerve cell body surrounded by numerous extensions. Most of these are dendrites, which collect information from other nerve cells or from sensory cells. Each neuron also has an extension called an axon, through which information passes outwards to other nerve cells. (KEYSTONE/SCIENCE PHOTO LIBRARY/National Institute on Drug Abuse, NATIONAL INSTITUTES OF HEALTH/Miles Herkenham, NIMH/SCIENCE PHOTO LIBRARY)