ALAIN POL, ISM / SCIENCE PHOTO LIBRARY ALAIN POL, ISM / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of neurones (nerve cells) from the cerebral cortex - the outer, heavily folded, grey matter of the brain. Neurones exist in varying sizes & shapes throughout the nervous system, but all have similar basic structure: a large central cell body (yellow-green, containing nucleus) & processes of 2 types: a single axon, or nerve fibre, which is the effector part of the cell that terminates on other neurones or organs; & one or more dendrites, smaller processes that act as sensory receptors. Similar types of neurones are arranged in layers in the cerebral cortex. Magnification: x162 at 35mm size.
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