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The Endowment for Human Development
The Endowment for Human Development
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Slideshow: Early Events

Eight-Cell Embryo

#47, Slide 10 of 24

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.
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