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9 Cards in this Set
- Front
- Back
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Day 0
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Fertilization by sperm, initiating embryogenesis
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within Week 1
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Implantation (blastocyst)
(zygote-morula-blastocyst) |
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within Week 2
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Bilaminar disk
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within Week 3
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1. Gastrulation
2. Primitive streak, notochord, neural plate begin to form |
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Weeks 3-8
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Neural Tube formed
Organogenesis *Extremely susceptible to teratogens |
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Week 4
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Heart begins to beat
upper and lower limb buds begin to form |
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Week 10
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Genitalia have male/female characteristics
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Monozygotic twinning is a splitting of the embryo at what stage?
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splitting at Blastocyst (or blastomere) stage (end of 1st week)
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decreased alpha-feto protein in amniotic fluid ass'd w/ ?
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Down syndrome
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