According to research there hasn't been many studies based on the development fo the central nervous system (CNS)in humans. Most studies deal with the brain development of many other species' because the scenarios are supposed to be relatively similar. Normal healthy brain development can occur only if prenatal check-ups are regular and if there are no genetic causes by mom or dad. Many abnormalities of the fetal CNS develop because one of both parents have engaged in activities that allow teratogens to cross the placenta. Teratogens are defined as any environmental agent that causes damage during the prenatal period. Teratogens include drug and alcohol usage as well as prenatal nutritional deprivation
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