PSYC 351 Chapter Notes - Chapter 4: Prenatal Development, Chorionic Villus Sampling, Caffeine
10 Dec 2013
School
Department
Course
Professor
Document Summary
Ovum is the largest cell of the body (size=. ) Stages of prenatal development are influenced by both nature and nurture: conception. Conception is also known as fertilization (the combination of an 23 chromosomes from egg with 23 chromsomes from sperm). Once every 28 days (half way through a woman"s menstrual cycle), an egg is released by either the right or left ovary into the fallopian tube. Over the next 24 hours, the egg can be fertilized by a sperm (which can stay in the woman for 2-3 days). Only one sperm penetrates the egg --> zygote: the period of the zygote (conception to 2nd week) Zygote multiplies rapidly as it continues its 4 day journey (10 cm) Zygote becomes from solid mass of cells-->hollow sphere-->cells begin to specialize (some inner cells will become embryo, some will support development) Zygote settles into the blood-enriched lining of the uterus and will remain attached throughout pregnancy.
