Gametogenesis, fertilization and implantation
9 important questions on Gametogenesis, fertilization and implantation
What are the two major classes of prenatal diagnosis techniques?
What are the stages of human embryonic development?
- cleavage and initiation of implantation (1st week)
- embryo transport through the uterine horn to the uterine wall
- nestling in the uterine wall
- bilaminar embryo and full implantation (2nd week)
- trilaminar embryo by gastrulation (3rd week)
- embryonic period (4th to 8th week)
- foetal period, everything except the lungs and urogenital system are present (8th week to birth)
What happens when implantation takes place?
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What is the zona pellucida?
What is the zona radiata?
What will the Heuser's membrane become eventually?
What is the pincing off of the yolk sac called and what will it develop in eventually?
In which things will the cytotrophoblast develop?
What are the (4) extraembryonic membranes and what is their function?
- Yolk sac
- surrounds the yolk
- mediates nutrition during development
- haemotopoiesis - formation of blood islands and beginning of the blood supply
- formation of germ cells
- Amnion
- surrounds the embryo with amniotic fluid
- prevents dehydration
- cushion for mechanical shocks
- regulation of temperature - mostly in birds
- Chorion
- surrounds the yolk and the embryo
- mediates exchange of gases between the embryo and the surrounding air
- Allantois
- functions as a disposal sac for certain metabolic waste products
- works together with the chorion as an initial respiratory organ
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