False-colour scanning electron micrograph (SEM) of a single neurone (nerve cell) of the human cerebral cortex - the outer grey matter of the brain. Neurones exist in varying sizes & shapes throughout the nervous system. A basic neurone consists of a cell body with processes of two types: a single axon (the output, effector nerve fibre) and one or more dendrites, smaller, input processes that serve as sensory receptors. In the cerebral cortex, neurones of comparable structure are arranged in a variable number of layers. Magnification: x3,100 at 6x7cm, x1,550 at 35mm size.

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