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Seven-Cell Embryo

54 hours

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.
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Seven-Cell Embryo
Seven-Cell Embryo
Eight-Cell Embryo
Eight-Cell Embryo
Nine-Cell Embryo
Nine-Cell Embryo
Ten-Cell Embryo
Ten-Cell Embryo
Morula: Twelve-Cell Embryo
Morula: Twelve-Cell Embryo
The Human Morula
The Human Morula
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