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9 Cards in this Set

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