THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY
Glial cells. Coloured scanning electron micrograph (SEM) of a glial cell (centre). Glial cells are nervous system cells that provide structural support and protection for neurons (nerve cells). In the human brain, the most concentrated region of glial activity is in the cerebral cortex, where there are about four glia for every neuron.
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