Transue Biology February 28th lecture

Transue Biology February 28th lecture - A Stages of...

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A. Stages of Development a. Fertilization b. Cleavage c. Blastulation d. Gastrulation e. Organogenesis Fertilization is a phase. Syngamy (one of the phases of development) - At end of acrosomal reaction, cell membranes fuse. Plasmogamy only. We did not get fusion of the nucleus yet. - The only thing the sperm contributes to the developing embryo (no energy, no mitochondria, etc.) Plasmogamy Where does it occur in a human? In the oviducts. In the first third of the oviduct. It can happen anywhere along the way, but typically It will occur in first third of the oviduct. Finger-like projecitons are called fimbria. How does the secondary oocyte move in the oviduct? Lining of oviduct is ciliated. Fimbria, which are ciliated, are beating toward the uterus. It brings the secondary oocyte towards the uterus. It is possible that it misses. Ectopic pregnancy: not inside the uterus. Embryo stats to develop, but it never gets out of the oviduct. Developmental process continues, but embryo is in oviduct. The reason why
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