Three types of CNS gliocytes are drawn as they would appear with a Golgi stain. Astrocytes are relatively large.They lend structural as well as a metabolic support. Two types of astrocytes are described. Fibrous astrocytes, located in white matter, have long sparsely branched processes. Protoplasmic astrocytes, located in gray matter, have numerous short highly branched processes. Oligodendrocytes are relatively small. They form myelin sheaths in the CNS, in addition to having a metabolic role. Microglia are small and tend to have elongate cell bodies. Being resident phagocytes, they are relatively rare in normal CNS tissue.