The human brain contains more than a billion neurons which
interconnect to form networks that process, store, and recall
sensory information. These neuronal activities are supported by a
group of accessory brain cells coll- tively known as neuroglia.
Surprisingly, glial cells are ten times more - merous than neurons,
and occupy more than half the brain volume (Hydén, 1961). Although
long considered a passive, albeit necessary, component of the