Embryo at About 11 Days

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

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.

Free Blastocyst (without zona)

Embryo Cross Section 8-9 Days

Embryo at About 11 Days

Tube Shaped Heart

Three-Week Embryo

Left Lateral View: 3-Week Embryo

11 days