The adult central nervous system contains glial cells of three different types: astrocytes, oligodendrocytes, and microglia.
The primary cell types of the central nervous system include neurons, glial cells (including astrocytes, oligodendrocytes, ependymal cells, and microglia), choroid plexus cells, and blood vessel and covering cells.
Innate immune cells called microglia play two key jobs in the brain that are shared by myelomonocytic innate immune cells in all mammalian organs: they defend against and phagocytize viruses, bacteria, and other foreign invaders, as well as they clear away cell debris to promote wound healing.
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