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The Endowment for Human Development

The Endowment for Human Development

Improving lifelong health one pregnancy at a time.

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Human Zygote

Human Zygote [Click for next image]

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From The Biology of Prenatal Development.

Label Key:

1. perivitelline space

2. zona pellucida

3. cell membrane

4. artifacts

All ages referenced to fertilization, not last menstrual period.

Single-Cell Embryo

Single-Cell Embryo

Zygote

Zygote

Human Zygote

Human Zygote

The Zygote

The Zygote

Two-Cell Human Embryo

Two-Cell Human Embryo

Two-Cell Embryo

Two-Cell Embryo

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