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Chapter 3 Prenatal Development

Chapter 3 Prenatal Development - Andrew Lynn Notes Chapter...

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Andrew Lynn 2/5/08 Notes: Chapter Three Prenatal Development I. Motivations for Parenthood A. Carry on family name, via boy B. Affectionate relationships C. Someone to take care of you when you get home D. How large? 1. 1-2, 1.8 children 2. Space out children 12 9 5 3. Religion basis 4. Pressure for college, age of women higher, fertility problems, 35 and older problems increase E. Time for Children? II. Prenatal development A. Zygote 1. Lasts about 2 weeks 2. Ends at implantation 3. Blastocyst-60 to 70 cells, fluid filled cell i. Embryonic disk—inner portion of blastocyst, new organism develops (a) Ectoderm—nervous system and skin (b) Mesoderm—muscles, skeletal system, circulatory system and other internal organs (c) Endoderm—digestive system, lungs, urinary tract, and glands ii. Trophoblast—thin outer ring of cells of the blastocyst, becomes the structures that provide protective covering and nourishment to the new organism (a) Amnion (b) Amniotic fluid (c) Yolk sac iii. Placenta—transports food and O2 to the developing organism, takes waste away iv. Umbilical cord B. Embryo 1. Begins at implantation to 8 weeks 2. Most rapid change of growth 3. Layers of embryonic disk differentiates around 3
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