chapter3 - Childhood and Adolescence: Voyages in...

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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Chapter 3 Prenatal Development
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Newly fertilized egg cells survive without any nourishment from the mother for more than a week. Your heart started beating when you were only one-fourth of an inch and weighed a fraction of an ounce. Prenatal Development: Truth or Fiction?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 If it were not for the secretion of male sex hormones a few weeks after conception, we would all develop external sex organs that look like those of females. Fetuses suck their thumbs and hiccough, sometimes for hours on end. Prenatal Development: Truth or Fiction?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 It is harmless to the embryo and fetus for a pregnant woman to have a couple glasses of wine in the evening. The same disease organism or chemical agent that can do serious damage to a 6-week-old embryo may have no effect on a 4-month-old fetus. Prenatal Development: Truth or Fiction?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Babies can be born addicted to narcotics and other drugs. Prenatal Development: Truth or Fiction?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 The Germinal Stage Wanderings
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Period from conception to implantation (approximately 2 weeks) Zygote repeatedly divides but does not gain in mass Travels down Fallopian tube to uterus After 3 or 4 days, implants in uterine wall Takes form of blastocyst Trophoblast, outer membrane of blastocyst, differentiates into membranes that will protect and nourish the embryo What Happens During the Germinal Stage?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Figure 3.1 The Ovarian Cycle, Conception and the Early Days of the Germinal Stage
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Prior to implantation, the dividing cells are nourished by the yolk of the original egg Once implanted, nourishment is obtained from the mother How Does the Dividing Mass of Cells Obtain Nourishment During the Germinal Stage?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 The Embryonic Stage
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Begins with implantation (3 rd week) through 8 th week Major organs systems differentiate Developmental trends Cephalocaudal – head takes precedence over lower parts of the body Proximodistal – central axis of body outward What Happens During the Embryonic Stage of Prenatal Development?
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus Chapter 3 Figure 3.2 Human Embryos and Fetuses at Various Stages of Development
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Childhood and Adolescence: Voyages in Development, Second Edition, Spencer A. Rathus
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chapter3 - Childhood and Adolescence: Voyages in...

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