Nine-Cell Embryo

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

The zona pellucida is appearing relatively thinner with time.

1. zona pellucida

2. perivitelline space

All ages referenced to fertilization, not last menstrual period.

Seven-Cell Embryo

Eight-Cell Embryo

Nine-Cell Embryo

Ten-Cell Embryo

Morula: Twelve-Cell Embryo

The Human Morula

57 hours