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Eight-Cell Embryo

56 hours


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
Source: Centro Riproduzione Assistita, Catania, Italy. All ages referenced to fertilization, not last menstrual period.
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
Early Blastocyst
Early Blastocyst
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