<prompt> Phagocytic cells in the CNS areOligodendrocytesSchwanncellsAstrocytesMicroglial cells  <response>: Microglia are scavenger cells that resemble tissue macrophages and remove debris resulting from injury infection and disease. Microglia arise from macrophages outside the nervous system. Ref: Ganong;s review of medical physiology; 23rd edition; pg:80 