01:830:331 Chapter Notes - Chapter 4: Prenatal Development, Basal Body Temperature, Gestational Age
4 Oct 2016
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Tender/swollen breasts or nipples, fatigue; need to take extra naps, slight bleeding or cramping, nausea with/out vomiting, food cravings, frequent urination, frequent, mild headaches, constipation, mood swings, faintness and dizziness, raised basal body temperature. Gestational age: usually dated from the first day of an expectant mother"s last menstrual cycle. Prenatal development takes place in 3 stages: germinal, embryonic, and fetal. Fertilized ovum grows into an embryo and then a fetus. Cephalocaudal principle: dictates that development proceeds from the head to the lower part of the trunk. Embryo"s head, brain, and eyes develop earliest and are disproportionately large until the other parts catch up. Proximodistal principle: development proceeds from parts near the center of the body to outer ones. Embryo"s head and trunk develop before limps, and the arms and legs before the fingers & toes. Germinal stage: first 2 weeks after fertilization. Zygote divides, becomes more complex, implanted in uterus wall. Within 36 hours of fertilization, the zygote enters mitosis.
