It is a type of nerve cell that protects CNS from infection and become phagocytic in response to inflammation

C: Microglia helps remove bacteria and cell debris from the CNS. A: Schwann cells form myelin sheaths around axons, or enclose unmyelinated axons in the peripheral nervous system. B: Ependymal cells line ventricles of the brain, circulate cerebrospinal fluid; some form choroid plexuses, which produce CSF. D: Astrocytes serves as the major supporting tissue in the CNS and contribute to the blood-brain barrier.