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6 Cards in this Set
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- Back
- 3rd side (hint)
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0 days: Fertilisation
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The fusion of a secondary oocyte and a spermatozoon to form a zygote
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0 - 6 days: Cleavage
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a series of cell divisions that subdivide a cytoplasm of the zygote
0. First Cleavage division 1. 2-cell stage 2. 4-cell stage 3. Early Morula 4. advanced Morula 5. hatching 6. blastocyst |
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7 - 10 days: Implantation
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7. blastocyst attaches to uterine wall
8. trophoblast cells divide rapidly = Cotrophoblast 9 - 10. ICM (Innermost cell mass) growth |
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8-9 days: The Week of Two's
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1. Trophoblast = cytotrophoblast and syncytiotrophoblast
2. Embryoblast (bilaminar germinal disk) = epiblast and hypoblast 3. 2 cavities = amniotic cavity and yolk sac cavity 4. extraembryonic Mesoderm = somatic cells and splanchric |
Tee2
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10-14 days: Gastrulation (week of three's)
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Gastrulation is a phase in embryonic development whereby the single layered blastula is reorganised into a trilaminar ("three-layered") structure: Gastrula.
The three layers: 1. Ectoderm 2. Mesoderm 3. Endoderm |
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20-28 days: Neurolation
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Neurulation refers to the folding process in vertebrate embryos, which includes the transformation of the neural plate into the neural tube. The embryo at this stage is termed the neurula.
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