<P> Development of the neural tube </P> <Table> <Tr> <Td> Central nervous system </Td> <Td> Brain </Td> <Td> Prosencephalon </Td> <Td> Telencephalon </Td> <Td_colspan="2"> <P> Rhinencephalon, Amygdala, Hippocampus, Neocortex, Basal ganglia, Lateral ventricles </P> </Td> </Tr> <Tr> <Td> Diencephalon </Td> <Td_colspan="2"> <P> Epithalamus, Thalamus, Hypothalamus, Subthalamus, Pituitary gland, Pineal gland, Third ventricle </P> </Td> </Tr> <Tr> <Td> Brain stem </Td> <Td> Mesencephalon </Td> <Td_colspan="2"> <P> Tectum, Cerebral peduncle, Pretectum, Mesencephalic duct </P> </Td> </Tr> <Tr> <Td> Rhombencephalon </Td> <Td> Metencephalon </Td> <Td> <P> Pons, Cerebellum </P> </Td> </Tr> <Tr> <Td> Myelencephalon </Td> <Td> Medulla oblongata </Td> </Tr> <Tr> <Td_colspan="5"> Spinal cord </Td> </Tr> </Table> <Tr> <Td> Central nervous system </Td> <Td> Brain </Td> <Td> Prosencephalon </Td> <Td> Telencephalon </Td> <Td_colspan="2"> <P> Rhinencephalon, Amygdala, Hippocampus, Neocortex, Basal ganglia, Lateral ventricles </P> </Td> </Tr> <P> Rhinencephalon, Amygdala, Hippocampus, Neocortex, Basal ganglia, Lateral ventricles </P>

How many neurons are in the central nervous system