90-98% OF BRAIN CELLS are gial, and are poorly understood. “There are different types of glial cells: astrocytes, oligodendrocytes, microglia, ependymal cells, radial glial, satellite cells and schwann cells. It is estimated that there are 10 to 50 times more glial cells than there are neurons in the brain.” Beware com sci calculations that compare apples and oranges. ”
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http://psychology.about.com/od/gindex/g/glialcells.htm