1. Finally, the third set of blastomeres are the deep cells. 2. An embryo counting 16 to 64 blastomeres is called a morula. 3. The blastocoele also allows blastomeres to move during the process of gastrulation. 4. This may also happen by the fusion of the first two blastomeres . 5. Fertilized eggs are sufficiently large to perform microinjections and blastomere isolations 6. This contact is required to distinguish one macromere as the official D quadrant blastomere . 7. The fate of the first cells, called blastomeres , is determined by its location. 8. Within the blastula, inner blastomeres are generally non-polar while epithelial cells demonstrate polarity. 9. Once specified, the D blastomere signals to surrounding micromeres to lay out their cell fates. 10. This layer forms in the extracellular matrix and functions as an adhesive substance for the blastomeres .
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