BLASTULA

Blastula

The blastula is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity called the blastocoele formed during an early stage of embryonic development in animals. Embryo development begins with a sperm fertilizing an egg to become a zygote which undergoes many cleavages to develop into a ball of cells called a morula. Only when the blastocoele is formed does the early embryo become a blastula. The blastula precedes the formation of the gastrula in which the germ layers of the embryo form.

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blastula

Noun

  1. An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.


The above text is a snippet from Wiktionary: blastula
and as such is available under the Creative Commons Attribution/Share-Alike License.

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