Immature precursors of neurons formed during the first phase of proliferation. It is estimated that they are formed at an average rate of 250,000 per minute throughout the nine months of human gestation, with a peak being reached of 500,000 per minute early in development (i.e., around 2 to 4 months of gestation in the human) when most of them are created. They develop into neurons aftermigration, and mitosis is then no longer possible.
See Basal ganglia (development), Brain (or encephalon), Cell migration, Cerebellum (development), Cerebral cortex (development), Glioblasts, Mitosis, Neurogenesis, Neuron, Proliferative ventricular zone, Progenitor cells