noun

definition

The stage of embryo development at which a gastrula is formed from the blastula by the inward migration of cells

Examples of gastrulation in a Sentence

Gastrulation takes place by epiboly, and the stomodaeum (oral invagination - mastax pharynx) takes place in two stages of the region of the closed blastopore.

It should be added that the process of development, the gastrulation as it is termed, may be shortened by the immigration of cells taking place C From Balfour, after Kowalewsky.

This is a process of gastrulation by invagination which is found in all animals above the Coelenterata, but which is very rare in the Cnidaria, and is known only in the Scyphomedusae amongst the Hydrozoa.

We have already seen that the parenchymula stage is passed over when the gastrulation is of the invaginate type.

Then follows the phenomenon of gastrulation, by which onehalf of the blastula is invaginated into the other, so as to obliterate the segmentation cavity.

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