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

Embryo at About 11 Days

#27, Slide 24 of 24

11 days

From The Biology of Prenatal Development.Buy Now

Note:

The inner cell mass gives rise to the epiblast and hypoblast.

Label Key:

1. amniotic cavity
2. extra-embryonic endoderm
3. amnion ectoderm
4. epiblast
5. hypoblast
6. primary yolk sac (also called the primary umbilical vesicle)
All ages referenced to fertilization, not last menstrual period.
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