<prompt> Phagocytosis in brain is caused by -AstrocytesMicrogliaOligodendrocytesEpendymal cells  <response>: Ans. is b i.e., Microglia Microglial cells are the major phagocytic cells in C.N.S. At the time of injury microglial cells modify to form macrophages called Gitter cells.Oligodendrocytes - They secrete myelin sheath in CNSSchwann cells - The secrete myelin sheath in peripheral nervous system. 