Definitions for: Gastrula

[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

Webster (1913) 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.

See Also: archenteron, conceptus, embryo, fertilized egg

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