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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

6 hours

Zygote [Click for next image]
From The Biology of Prenatal Development.Buy Now

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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