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The Endowment for Human Development
The Endowment for Human Development
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Slideshow: Early Events

Embryo Cross Section 8-9 Days

#26, Slide 23 of 24

8 days

From The Biology of Prenatal Development.Buy Now

Note:

The inner cell mass has divided into the epiblast and the hypoblast.

Label Key:

1. amniotic ectoderm
2. epiblast
3. amniotic cavity
4. hypoblast
All ages referenced to fertilization, not last menstrual period.
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