Image Gallery
Nine-Cell Embryo
![Nine-Cell Embryo [Click for next image]](/images/prenatal_unlabeled_655/nine-cell-embryo.jpg "Click for next image")
| 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
Eight-Cell Embryo
Nine-Cell Embryo
Ten-Cell Embryo
Morula: Twelve-Cell Embryo
The Human Morula
