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

57 hours

Source: Centro Riproduzione Assistita, Catania, Italy.

Note:

It is becoming more difficult to count the number of cells as more of them are out of focus when looking through the microscope.

Note:

The zona pellucida is appearing relatively thinner with time.

Label Key:

1. zona pellucida
2. perivitelline space
All ages referenced to fertilization, not last menstrual period.
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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