PSY 2105 Chapter 4: Chapter 4 - Prenatal Development.docx

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2105
• Professor: David Collins

Document Summary

Conception: fertilization of the egg by the sperm formation of zygote (24 hour window) Period of the zygote: conception to the second week. September 26th 2012 implantation in uterus lining at 1 week: prenatal development already underway by the time a woman suspects she may be pregnant. Period of the embryo: the third to the eighth week. Embryonic period (3 8 weeks: embryo forms different layers of cells. Outside layer; becomes nervous system, sensory receptors, and skin. Middle layer; becomes circulatory system (heart begins to beat at 4 weeks), muscles, bones, excretory system, and reproductive system. Inner layer; becomes digestive system and respiratory system: development of other pre-natal essentials. Where blood vessels of mother and child intertwine. Organ that allows mom and baby to interact. Connecting link between fetus and placenta: transports oxygen and nutrients to fetus from the placenta and returns waste products from the fetus to the placenta, contains no pain receptors.