Two-Cell Human Embryo

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Each cell in the early embryo is called a blastomere.

1. perivitelline space

2. outline of blastomere #1

3. zona pellucida

4. cell membrane of blastomere #2

All ages referenced to fertilization, not last menstrual period.

Human Zygote

The Zygote

Two-Cell Human Embryo

Two-Cell Embryo

Three-Cell Embryo

Four-Cell Human Embryo

36 hours