Across
- 5. Embryonic form that develops from a berrylike cluster of cells, the morula.
- 6. The precursor cells of the human placenta.
- 7. It occurs when the oocyte is penetrated by more than one sperm.
- 8. Germ layer that gives rise to the nervous system.
- 9. Structure that has the fate to become embryo proper.
Down
- 1. Rearrangement of the cells of the blastula and ultimately formation of the three germ layers of the embryo.
- 2. It is the development of the organs that begins during the third to eighth week, and continues until birth.
- 3. A diploid cell resulting from the fusion of two haploid gametes.
- 4. Specialized extracellular matrix surrounding the developing oocyte.