Part of the hippocampus called the dentate gyrus includes at birth about 90% of the number of cells that it will have in adulthood, meaning that about 10% of the neurons in this layer will be generated after birth.

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The dentate gyrus is one of the few regions in the brain where neurogenesis (the process of generating new neurons) occurs throughout life, suggesting that more than 10% of its neurons can be generated after birth.

Part of the Hippocampus Called the Dentate Gyrus Includes at Birth