The Human Morula

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The morula stage is reached when about 12 to 16 cells are present. This morula may contain 30 cells or more.

1. perivitelline space

2. zona pellucida

All ages referenced to fertilization, not last menstrual period.

Ten-Cell Embryo

Morula: Twelve-Cell Embryo

The Human Morula

Early Blastocyst

Blastocyst

Blastocyst with Inner Cell Mass

3 days