sample-smalt-billede.jpg

Day 4, Morula stage


On the fourth day after oocyte retrieval, the cells divided once again. There are now so many cells inside the zona pellucida that it is difficult to count them. The individual cells are also starting to stick together so that they begin to form a coherent lump that resembles a bunch of berries. The Latin name for this is morula.

Continue to Blastocyst stage