Image Gallery
Four-Cell Embryo
![Four-Cell Embryo [Click for next image]](/images/prenatal_numbered_655/four-cell-embryo.jpg "Click for next image")
| Source: Centro Riproduzione Assistita, Catania, Italy. |
Label Key:1. blastomere #1 2. blastomere #2 3. blastomere #3 4. blastomere #4 5. zona pellucida 6. inside border of zona pellucida 7. perivitelline space |
| All ages referenced to fertilization, not last menstrual period. |
Three-Cell Embryo
Four-Cell Human Embryo
Four-Cell Embryo
Five-Cell Embryo
Six-Cell Embryo
Seven-Cell Embryo
