We have the central nervous system, which includes the brain and the spinal cord and we have the peripheral nervous system, which includes everything else. And these two divisions themselves contain their own different types of neuroglia. So let's discuss the different types of neuroglia in the central nervous system as well as in the peripheral nervous system. So within the central nervous system, we have four major types. We have astrocytes, we have appendimal cells, we have oligodendrocytes and we have microglia. Within our peripheral nervous system, we have satellite cells and schwann cells.