MOTHER'S DAY GLIAL CELL: This glial cell (green) wraps its ample dendritic arms around a neuron (red).

• Although glia, named after the Greek for glue, don't receive as much attention in the press, they nourish, support and protect our neurons.

• The amount of brain tissue that is made up of glial cells increases with brain size: the nematode brain contains only a few glia; a fruit fly's brain is 25% glia; that of a mouse, 65%; a human, 90%; and an elephant, 97%.


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