PSYCH211 Lecture Notes - Lecture 3: Thyroid, Postpartum Period, Prenatal Care
8 Feb 2016
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Prenatal development begins when a sperm fertilizes an egg. Prenatal development the changes that transform the fertilized egg into a newborn human make up. Health professionals measure the start of your pregnancy from the day of your last period which is typically 2 weeks before conception. Prenatal gestation takes about 38 weeks and can sometimes add an additional 5 weeks (37 days) 38 weeks of prenatal development is divided into three stages: the period of the zygote, the period of the embryo, and the period of the fetus. The first period begins with fertilization and lasts about 2 weeks it ends with the fertilized egg called the zygote grows rapidly through cell division. It implants itself in the wall of the uterus. It travels down the fallopian tube toward the uterus, and within hours the zygote undergoes its first cell division it consists about 100 cells and resembles a hollow, fluid-filled ball.
