PSYC 2450 Chapter Notes - Chapter 4: List Of Greyhawk Characters, Cognitive Deficit, Cretinism
13 Mar 2013
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Prenatal development: development that occurs between the moment of conception and the beginning of the birth process. Time when all the major organs are formed and the heart begins to beat: period of the fetus from the ninth week until the child is born. Zygote moves down fallopian tube towards uterus, divides by mitosis into two cells. Those 2 cells and all other cells continue to divide and form a ball-shaped structure called blastocyst. (contains 60 to 80 cells within 4 days of conception) The inner layer of the blastocyst or embryonic disk becomes the embryo, whereas the outer layer of cells will develop into tissues that protect and nourish the embryo. Blastocyst approaches the uterus 6 to 10 days after conception; small tendrils emerge from its outer surface. When reaching the uterine wall, tendrils burrow inward, tapping the mother"s blood supply implantation (burrowing of blastocyst into lining of uterus)
