A unique feature of mammalian reproduction is the prolonged protective period afforded to the young, which often extends for years after birth. During the earliest stages of critical development, maximum protection is given by retaining the fetus within the mother. Intrauterine pregnancy marked a major evolutionary departure from previous modes of reproduction, requiring anatomic and physiologic adjustments on the part of the mother and fetus. The development of the placenta by the fetus is unique among these adjustments in that the sole function of this organ is to make intrauterine pregnancy possible.
KeywordsChorionic Villus Fetal Circulation Intrauterine Pregnancy Book Medical Publisher Dehydroepiandrosterone Sulfate
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