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Lecture 4

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PSYC 2450
Anneke Olthof

LECTURE 4 1PRENATAL DEVELOPMENTAn overview of the phasesGERMINAL PERIOD from conception to implantation and lasts 14 days PERIOD OF THE EMBRYO this is where all vital organs are formed and lasts from week 3 to week 8PERIOD OF THE FETUS this where growth and refinement of the fetus occurs and lasts from week 9 to birth2GERMINAL PERIODZygote transforms via mitosis Cell differentiation also beginsThe embryonic disk develops into the embryoThe outer layer transforms into the followingAMNION is a cushion against blows helps regulate temperatureCHORION surrounds the amnion and the lining develops into the placentaPLACENTA is a semipermeable membrane used for the exchange of oxygen and nutrients between baby and mother BLOOD CANNOT PASS THROUGH the placenta is fully formed by 4 months of age
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