PSYB32H3 Chapter Notes - Chapter 3: Globulin, Infant Mortality, Muscle Tone
Document Summary
Identify and describe the major events of the three periods of prenatal development. Eustachian tubes, glands, and vital organs (lungs, pancreas, liver: prenatal development is guided by cephalocaudal (from head to legs), proximal-distal (from center to more distant areas, most miscarriages/ spontaneous abortions occur during this period. 6 principles describe the effects of teratogens on prenatal development (eg. ) During embryonic stage the most vulnerable to teratogen. Each organ system has a different critical period (eg. The heart 20~40 days of life: each teratogen exerts certain specific effects. Rubella/ german measles in mother"s affect fetus eyes, heart and brain/ the drug thalidomide causes primarily malfunctions of the limbs: either maternal/ fetal genotypes may counteract a teratogen"s effects. Not all pregnant women who have german measles have defective infants: the effects of one teratogen may intensify the effects of another. The mothers physiological status, nutrition, and hormonal balance modify the impact of a teratogen.
