Image Gallery
Two-Cell Embryo
![Two-Cell Embryo [Click for next image]](/images/prenatal_unlabeled_655/two-cell-embryo.jpg "Click for next image")
| Source: Centro Riproduzione Assistita, Catania, Italy. |
Label Key:1. zona pellucida 2. perivitelline space 3. blastomere #1 4. blastomere #2 5. cell membrane of blastomere #1 |
| All ages referenced to fertilization, not last menstrual period. |
The Zygote
Two-Cell Human Embryo
Two-Cell Embryo
Three-Cell Embryo
Four-Cell Human Embryo
Four-Cell Embryo
