Gastrula

gastrulation
the formation of the gastrula stage in embryonic development by an invagination by which the future digestive tract is formed
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Gastrula
(plural: gastrulae) [L. gastrula - the belly, stomach] The early embryonic stage following the blastula stage during which cell migrations form distinct germ layers.
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The gastrula phase of embryonic development is seen in all animals except the sponges. It follows the blastula phase. The purpose of gastrulation is to position the three embryonic germ layers, the endoderm, ectoderm and mesoderm.
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The gastrula phase of embryonic development is seen in all animals except the sponges. It follows the blastula phase. The gastrula phase is marked by a dramatic restructuring called gastrulation.
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Gastrulation forms three major "germ layers": ectoderm, mesoderm, and endoderm. By gastrulation, the genes of the zygote genome are being expressed.
View these stages as they occur in amphibians such as Xenopus laevis, the South African clawed frog.
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gastrulation
(gas-truh-lay-shun)
The formation of a gastrula from a blastula.
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gastrulation The embryological process that results in the formation of the gastrula; results in the formation of the embryonic gut, ectoderm, and endoderm.138 ...
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Gastrulation involves a series of cell migrations to positions where they will form the three primary cell layers.
Ectoderm forms the outer layer.
Endoderm forms the inner layer.
Mesoderm forms the middle layer.
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gastrulation - stage in animal development following cleavage characterized by extensive cell movement and rearrangement to form a "three-layered" embryo of ectoderm, mesoderm and endoderm.
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gastrulation
The formation of a gastrula from a blastula.
Covered in Lab 14 Gametogenesis and Development ...
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In embryos homozygous for loss-of-function alleles of hh, expression of en is lost from ectodermal cells after gastrulation (DiNardo, 1988), indicating that the activity of hh, like that of wg, is also required for the maintenance of en transcription.
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