blastosphere
/ˈblæstəˌsfɪr/
noun
- An early stage of an embryo consisting of a hollow ball of cells, also called a blastula.
- A healthy blastosphere is essential for successful implantation in mammals.
- The blastosphere forms after the fertilized egg has divided several times.
- In many animals, the blastosphere eventually folds inward to form the gastrula.
Synonyms