During the two-phase process of proliferation, neuroblasts and glioblasts are created in the future site of the ventricular system, with glioblasts going on to form the basic support structures in the mature brain. They emerge during the second phase that occurs from about 2 to 4 months of gestation in the human, but which undergo their most rapid differentiation from about 5 to 12 months postnatally.
See Cell migration, Glia cells, Neuroblasts, Progenitor cells, Proliferative ventricular zone