Jaymie Ticknor Developmental Psychology 3620 Sect 853 18 September 2013 Lecture 8 Chapter 5 Powerpoint Prenatal Development 3 Stages of Prenatal Development Germinal Stage 0 2 weeks Embryonic Stage 2 weeks 2 months Fetal Stage 2 months birth Germinal Stage 0 2 weeks Ovulation Fertilization Zygote fertilized egg Cell Division Blastocyst Implantation in the uterine wall traveling down takes 5 days Blastocyst inner cell mass becomes embryo and amnion Trophoblast becomes placenta chorionic villi inside placenta and chorion From 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 system Endoderm inside respiratory system digestive system liver and pancreas internal organs Placenta develops to feed the embryo Where maternal and fetal blood exchange oxygen and nutrients placental osmosis Maternal and fetal arteries and veins not directly connected Embryonic Stage 2 weeks 2 months Primitive heart beats Spontaneous movement 8 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 damage 50 80 miscarriage due to chromosomal abnormalities Fetal Stage 2 months birth Sexual differentiation 9 weeks Prenatal breathing 10 weeks breathe fluid that surround the fetus Fetal activity 12 16 weeks felt by Mother Developmental of the senses Cutaneous touch chemical smell and taste auditory and visual
View Full Document
Unlocking...