Glial Cells

The glial cells form the supporting tissue of the nervous system and are involved in the (saltatory) propagation of excitation. Glial cells are significantly more numerous than neurons: They represent almost 90% of all cells of the CNS. Glial cells perform very different functions and therefore differ considerably in their morphology. We distinguish the glial cells of the peripheral nervous system (Schwann cells) from the glial cells of the central nervous system. In the CNS there are the macroglia (these are the astrocytes and the oligodendrocytes), the microglia (these are the Hortega cells) and finally the ependym cells.

• The Schwann cells form the myelin sheaths in the PNS and the oligodendrocytes form the myelin sheaths in the CNS. *The astrocytes are involved in the formation of the blood-brain barrier, *the ependym cells line the brain ventricles and *the hoard gazelles are phagocytes of the brain.

https://de.wikipedia.org/wiki/Gliazelle _{(Wikipedia CC-by-sa-3.0)}