For a long time, the adult brain was believed to be incapable of producing new neurons. This view has changed. We now understand that neurogenesis — the formation of new nerve cells — continues throughout life , especially in specific regions of the brain. One such region is the hippocampus. Understanding neurogenesis requires understanding where it occurs and why that location matters. The Hippocampus as Part of the Central Nervous System The central nervous system (CNS)