Embryo Cross Section 8-9 Days

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

1. amniotic ectoderm

2. epiblast

3. amniotic cavity

4. hypoblast

All ages referenced to fertilization, not last menstrual period.

Hatched Blastocyst

Free Blastocyst (without zona)

Embryo Cross Section 8-9 Days

Embryo at About 11 Days

Tube Shaped Heart

Three-Week Embryo

8 days