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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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Seven-Cell Embryo

54 hours

Seven-Cell Embryo [Click for next image]
Source: Centro Riproduzione Assistita, Catania, Italy.

Note:

As the cells divide and increase in number, the overall size of the embryo remains essentially unchanged. The large blastomere will be the next to divide.

Label Key:

1. zona pellucida
2. perivitelline space
3. large blastomere
All ages referenced to fertilization, not last menstrual period.
Five-Cell Embryo
Five-Cell Embryo
Six-Cell Embryo
Six-Cell Embryo
Seven-Cell Embryo
Seven-Cell Embryo
Eight-Cell Embryo
Eight-Cell Embryo
Nine-Cell Embryo
Nine-Cell Embryo
Ten-Cell Embryo
Ten-Cell Embryo
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