PSY 100 Lecture Notes - Lecture 12: Primitive Streak, Prenatal Development, Structure Formation
Document Summary
Continuity: think of it like an escalator. In some ways, we all change with age! 1 out of 2 million sperm got to fertilize the egg! 10 days after conception implantation occurs: zygote (fertilized egg) 4 to 8-9 weeks (22 days after conception) *zygote becomes the embryo and placenta: fetus. If the fetus is born 3 weeks early = pre-term. Age of viability: approximately 22 weeks after conception. Fetus gains about 4. 5 lbs. in the last three months. 28th week auditory communication from mother to child. Prenatal development: some factors affecting prenatal development. Mother"s influence: use of drugs, pollution, radiation, getting sick, fetal alcohol syndrome. Father"s influence: needs good diet, obesity is associated with unhealthy sperm, low stress lifestyle, not wearing tight underwear. Birth: approximately 38 weeks after conception fetal brain triggers release of hormones. Contractions begin 5 minutes apart and towards the end 1 min. apart: delivery. Cervix dilates to allow for passage of the baby"s head: afterbirth.
