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Unformatted text preview: Chapter 4: Pregnancy and Prenatal Development I. Prenatal Development A. Cephalocaudal principle- Development in a head-to-tail direction- upper parts of the body develop before lower parts - head, brain, eyes B. Proximodistal principle- Development from within to without- parts of the body near the center develop before the extremities - internal, vital organs II. Three Stages of Development A. The Germinal Stage (Fertilization to 2 Weeks) characterized by rapid cell division (mitosis) increasing complexity and differentiation implantation in the wall of the uterus B. The Embryonic Stage (2 to 8 Weeks) characterized by rapid growth development of major body systems and organs- respiratory, digestive, nervous systems a critical period in development Spontaneous abortion (miscarriage)- Natural expulsion from the uterus of a embryo that cannot survive outside the womb C. The Fetal Stage (8 Weeks to Birth) increased differentiation of body parts greatly enlarged body size...
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- Fall '09