PSYA02H3 Chapter Notes - Chapter 11: Fetal Alcohol Spectrum Disorder, Prenatal Development, Konrad Lorenz
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PSYA02H3 Full Course Notes
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Prenatal stage- ends with birth, begins 9 months earlier. Prenatal development zygote- fertilized egg that contains chromosomes from both a sperm and an egg, ultimately becomes gender. Each sperm and egg contains 23 chromosomes, which contain genes, x or y. Germinal stage is the 2 week period that begins at conception. Zygote migrates back down the fallopian tube and implants itself in the wall of the uterus. Embryonic stage is period that lasts from second week until about the eighth week, zygote is now embryo. Fetal stage is period that lasts from the ninth week until birth. Embryo has skeleton and muscles, make it capable for movement, during last 2 months, size of fetus increases. Formation of fatty sheath around the axons of a neuron aka mylenation. Process starts during the fetal stage but doesn"t end for years, mylenation of the cortex, continues into adulthood. Why are humans born with underdeveloped brains? house them.
