Answer:
There are four types of neuroglia found within the central nervous system:
Astrocytes :
It maintains the blood brain barrier and preserve the chemical environment by recycling ions and neurotransmitters.
Oligodendrocytes :
The myelinate axons in the central nervous system and provide an overall structural framework.
Ependymal cells :
The line ventricles (brain) and central canal (spine) and are involved in the production of cerebrospinal fluid.
Microglia :
It removes cell debris, wastes and pathogens via phagocytosis.