Neural stem cells are highly undifferentiated stem cells that originate within the central systema nervosum . These cells have the potential to grow and form neurons. These cells help within the neural repair after injury or diseases. In mature CNS, neural stem cells contribute towards neurogenesis. The proliferation of Neural Stem Cells reduces with aging. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of comparable kind. It reflects the typical number of citations to recent articles published in science and science journals during a particular year or period, and is usually used as a proxy for the relative importance of a journal within its field. The impact factor of a journal is evaluated by dividing the amount of current year citations to the source items published therein journal during the previous two years.