NATS 1675 Lecture Notes - Lecture 6: Ectopic Pregnancy, Zona Pellucida, Petri Dish
4 Aug 2015
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Document Summary
Conception is not complete until the embryo has successfully implanted in the. With invetro fertilization (fertilization occurs in a petri dish), there are limits as to how many days the embryo can be outside the uterus (14 days) Reason: the nervous system develops at about 14 days. Embryo applies to the first 10-12 weeks of development. After that, the fetus has taken on human appearance; it is called a fetus the term fetus is a medical/legal term. Theoretically the fetus can survive outside the uterus anytime after 20 weeks. 25-28 weeks gives the baby enough time to survive. Zygote refers to the fertilized egg. Two nuclei sperm nucleus and oocyte nucleus. Polar bodies packages of genetic information of the unequal division during meiosis (these shed off) Fertilization can take place +/- 2 days from ovulation. Sperm can live 24-48 hours in the oviducts.
