Neuroglia, or glial cells, are essential for maintaining the homeostasis of the nervous system. Types of neuroglia include astrocytes, oligodendrocytes, microglia, and ependymal cells in the central nervous system (CNS), and Schwann cells and satellite cells in the peripheral nervous system (PNS). Astrocytes support the blood-brain barrier, oligodendrocytes and Schwann cells produce myelin, microglia act as immune cells, and ependymal cells line the ventricles of the brain.
