Blastula. A hollow sphere of cells surrounding a fluid-filled cavity. Many animals produce a blastula stage embryo early in development, prior to gastrulation. |
23 нояб. 2024 г. · After the cleavage has produced over 100 cells, the embryo is called a blastula. The blastula is usually a spherical layer of cells (the ... |
The marginal tier of blastomeres in the early blastula have a unique fate. They lie against the yolk cell and remain cytoplasmically connected to it throughout ... |
In Xenopus, the Spemann organiser is defined as a dorsal territory in the early gastrula that initiates development of the embryonic axis. |
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