Blastula

Missing image
Blastulation.png
Blastulation. 1 - morula, 2 - blastula.

The blastula is an early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. The blastula follows the morula and precedes the gastrula in the development sequence. A blastula has around 128 cells, with a large central cavity called the blastocoel. Also called blastosphere. Template:Biosci-stubes:Blástula pl:Blastula pt:Blástula

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