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Cell division does not happen in neurons.why?
Though new neurons are generated by glia in restricted brain regions, cell divison does not happen in neurons . The exact  reason is not known. Scientists are doing research in  the area of Neurobiology and awaiting for a conclusion.
 Cell division is a complex process that requires the precise organization  of many cellular components. These components are largely under the control of specialized cell cycle proteins. Other proteins that are required for the full differentiation and maturation of neurons may bind and inactivate these cell cycle proteins, so perhaps a differentiated neuron cannot divide because the proteins required for cell division are "tied up" in the maintenance of a differentiated state.  It is the centrioles which function in cell division, but neurons lack centrioles.
One possibility is that neuronal division is logistically difficult. Neurons have many long processes that contact thousands of other neurons. Division would require complex cytoskeletal rearrangements and navigation through brain tissue that is densely packed with processes. Usually, mitotic cells have a simple shape to avoid these issues.
Another possible reason that neurons are amitotic.


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