01:830:331 Chapter Notes - Chapter 2: Amniotic Sac, Intrauterine Growth Restriction, Amniotic Fluid
14 Nov 2013
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Chapter 2: prenatal development and the newborn period. Aristotle rejected the idea of preformation in favor of what he termed epigenesis. Epigenesis: the emergence of new structures and functions in the course of development. Gametes (germ cells): reproductive cells- egg and sperm- that contain only half the genetic material of all the other cells in the body. Gametes are produced through cell division 46 chromosomes 23 pairs of chromosomes. Conception: the union of an egg from the mother and a sperm from the father. Embryo: the name given to the developing organism from the 3rd to 8th week of prenatal development. Fetus: the name given to the developing organism from the 9th week to birth. Stem cells: embryonic cells, which can develop into any type of body cell. Phylogenetic continuity: the idea that because of our common evolutionary history, human share many characteristics, behaviors, and developmental processes with other animals, especially mammals.
