<prompt> Macrophage of Central Nervous System includesAstrocytesMicrogliaNeuronOligodendrocyte  <response>: B Microglia Microglia are tissue macrophages that populate the mammalian central nervous system CNS very early in embryonic development. By adulthood, microglia are found in all regions of the brain and spinal cord and comprise 10-15 of the total cells in the CNS. 