Over the past two decades advances in reproductive biology and medicine have made important strides in alleviating many conditions of sub-sterility in the human. It is the general consensus that gametes and embryos from other mammalian species are not good models for the study of human embryology and therefore assisted reproductive technologies have also been fundamental and opportune in providing material for the systematic study of human embryology. A global increase in human reproductive incompetence due to environmental stress make such studies essential.