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20 Cards in this Set
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- Back
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Stages from oocyte --> Morula?
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1. Oocyte
2. Fertilization 3. Zygote 4. 2-cell stage 5. 4-cell stage 6. 8-cell stage 7. Morula |
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Day 1 after fertilization: how many blastomeres?
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2
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Day 1 after fertilization: size of blastomeres?
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Smaller than parenting cell
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Day 1 after fertilization: size of embryo?
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Same size as long as z.pellucida still intact
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Day 1 after fertilization: components of zygote?
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- 2 blastomeres
- 2 polar bodies - Zona pellucida |
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Day 3 after fertilization: How many blastomeres?
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12-16 = Morula
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Which day does zygote become morula?
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Day 3
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Ectopic implantation happens where?
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In the fallopian tube just after fertilization. Death of embryo. May also cause death of mother due to rupture & internal bleeding.
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When may we call zygote a blastocyst?
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Day 4
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How many blastomeres in a blastocyst?
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Around 60
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When does the blastocyst loose zona pellucida?
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Day 5. As a late blastocyst. Implantation happens then.
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What is a "start-shot" for implanatation?
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When zona pellucida is lost from blastocyst
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Components of a blastocyst?
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- Trophoblasts
- Embryoblasts - Blastocystic cavity |
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Implantation may be either?
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Intrauterine
Ectopic (extrauterine) |
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Function syncytiotrophoblasts in implantation?
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- Invades endometrium
- Create nourishment for embryo by releasing hydrolytic enzymes |
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Function of cytotrophoblasts in implanation?
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Source of:
- Extraembryonic mesoderm - Amnion |
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Hypoblasts are developed after?
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7 days
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Epblasts are developed after?
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8 days
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What makes up the bilaminar embryonic disc?
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Hyp & epiblasts
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What is "captured" inside hypoblast lining & cytotrophoblast surrounding?
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Embryoblasts
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