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The Endowment for Human Development
The Endowment for Human Development
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Eight-Cell Embryo

56 hours

Source: Centro Riproduzione Assistita, Catania, Italy.

Note:

It seems to be getting crowded in there! Note the five cells (blastomeres) in the back row and the three cells in the front row.

Label Key:

1. zona pellucida
2. perivitelline space
3. polar body
All ages referenced to fertilization, not last menstrual period.
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
Morula: Twelve-Cell Embryo
Morula: Twelve-Cell Embryo


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