In reptiles and birds, these progenitor cells give rise to young neurons that migrate into many regions of the forebrain. Adult neurogenesis at the ventricle has been most extensively studied in organisms with small brains, such as reptiles, birds, and rodents. In many vertebrates, neurogenesis continues postnatally and into adulthood in this region. The walls of the cerebral ventricles in the developing embryo harbor the primary neural stem cells from which most neurons and glia derive.
