Jaymie TicknorDevelopmental Psychology 3620 Sect. 85318 September 2013Lecture #8Chapter #5 PowerpointPrenatal Development:3 Stages of Prenatal Development:Germinal Stage: 0-2 weeksEmbryonic Stage: 2 weeks-2 monthsFetal Stage: 2 months-birthGerminal Stage: 0-2 weeks; Ovulation → Fertilization → Zygote (fertilized egg)Cell Division → BlastocystImplantation in the uterine wall (traveling down takes 5 days)Blastocyst: inner cell mass becomes embryo and amnionTrophoblast becomes placenta (chorionic villi inside placenta) and chorionFrom Blastocyst to Embryo: three layers of inner cell mass:Ectoderm (outside) - skin, sense organs, brain, and spinal cord (nervous system)Mesoderm (middle) - muscles, blood, bones, and circulatory systemEndoderm (inside) - respiratory system, digestive system, liver, and pancreas (internal organs)Placenta develops to feed the embryoWhere maternal and fetal blood exchange oxygen and nutrients (placental osmosis)Maternal and fetal arteries and veins not directly connectedEmbryonic Stage: 2 weeks-2 monthsPrimitive heart beatsSpontaneous movement8 weeks: organs/structures laid down (organogenesis)Half is a head at 8-9 weeks (cephalo-causal development) (head first, tail last)Critical, rapidly development and sensitive to damage50%-80% miscarriage due to chromosomal abnormalitiesFetal Stage: 2 months-birthSexual differentiation: 9 weeksPrenatal “breathing”: 10 weeks (breathe fluid that surround the fetus)Fetal activity: 12-16 weeks felt by MotherDevelopmental of the senses:Cutaneous (touch) → chemical (smell and taste) → auditory and
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