Meaning of GASTRULA
Pronunciation: | | 'gastrûlu
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WordNet Dictionary |
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| Definition: | | [n] double-walled stage of the embryo succeeding the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm |
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| See Also: | | archenteron, conceptus, embryo, fertilized egg | |
Webster's 1913 Dictionary |
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| Definition: | | \Gas"tru*la\, n.; pl. {Gastrul[ae]}[NL., dim. fr. Gr. ?
the stomach.] (Biol.)
An embryonic form having its origin in the invagination or
pushing in of the wall of the planula or blastula (the
blastosphere) on one side, thus giving rise to a
double-walled sac, with one opening or mouth (the blastopore)
which leads into the cavity (the archenteron) lined by the
inner wall (the hypoblast). See Illust. under {Invagination}.
In a more general sense, an ideal stage in embryonic
development. See {Gastr[ae]a}. -- a. Of or pertaining to a
gastrula.
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Biology Dictionary |
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| Definition: | | A hollow ball of cells with one part of the ball pushed into the interior blastocoele (called an invagination). This early stage of animal embryonic development forms just after the blastula stage. By the end of the gastrulation process, the different embryonic germ layers (endoderm, ectoderm, and sometimes mesoderm) can clearly be identified. |
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