Talk about glial cells

Glial cells of the CNS (central neuroglia) are more numerous than neurons. They occupy the spaces left free by the neurons and their extensions and they intervene between the neurons and the blood capillaries. They have a supporting role because they make the nervous tissue more compact, and they provide multiple functions: defense of the nervous system, synthesis of myelin, regulation of neuronal activity, nutrition ... Their morphological and functional characteristics are very different from those of neurons. In the CNS, glial cells are of four types: astrocytes, oligodendrocytes, microglia and ependymocytes.