<prompt> Macrophages in nervous system is known as:Schwann cellsOligodendrocytesAstrocytesMicroglia  <response>: Microglia are scavenger cells that resemble tissue macrophages and remove debris resulting from injury, infection, and disease eg, multiple sclerosis, AIDS-related dementia, Parkinson disease, and Alzheimer disease. Microglia arise from macrophages outside of the nervous system and are physiologically and embryologically unrelated to other neural cell types. Ref: Ganongs Review of Medical Physiology 23rd edition, Chapter 4. 