PSYC 2450 Chapter Notes - Chapter 4: Aids, Umbilical Cord, Congenital Disorder
14 Apr 2013
School
Department
Course
Professor
Document Summary
From the moment of conception, it will take approx. 266 days for the one-celled zygote to become a fetus. There are 3 major stages of prenatal development: (attaching to the uterus). Lasts ~10-14days: period of the zygote (germinal period)- lasts from conception , through implantation, period of the embryo- lasts the beginning of the 3rd week end of 8th, period of the fetus- 9th week birth. Here all the major organs form and heart beat begins. All major organs systems begin to function and organism grows quickly burrow into the uterine wall, tapping into the mother"s blood supply. Blastocyst- a ball shaped structure containing 60-80 cells, formed within 4days of conception. Embryo- this is what the inner layer of the blastocyst the embryonic disk, becomes. Outer layer of cells develops into tissues that protect and nourish the embryo. Implantation- (6-10d after conception) small tendrils appear on the surface of the blastocyst and.
