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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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Zygote

Zygote [Click for next image]

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From The Biology of Prenatal Development.

Label Key:

1. zona pellucida

2. cell membrane

3. perivitelline space

4. artifact

5. cytoplasm

All ages referenced to fertilization, not last menstrual period.

Secondary Oocyte

Secondary Oocyte

Single-Cell Embryo

Single-Cell Embryo

Zygote

Zygote

Human Zygote

Human Zygote

The Zygote

The Zygote

Two-Cell Human Embryo

Two-Cell Human Embryo

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