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Definition of Gastrula
1. Noun. Double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm.
Definition of Gastrula
1. n. 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 Gastræa.
Definition of Gastrula
1. Noun. (embryology) A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm. ¹
¹ Source: wiktionary.com
Definition of Gastrula
1. a metazoan embryo [n -LAS or -LAE]
Medical Definition of Gastrula
1. Embryonic stage of an animal when gastrulation occurs, follows blastula stage. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)
Lexicographical Neighbors of Gastrula
Literary usage of Gastrula
Below you will find example usage of this term as found in modern and/or classical literature:
1. The Encyclopedia Americana: A Library of Universal Knowledge (1918)
"The chief axis of the gastrula coincides with that of the adult, the apical pole
of the gastrula being indicated by the head cf the arrow. ..."
2. Lessons in elementary biology by Thomas Jeffery Parker (1898)
"The two layers are continuous at the aperture of the cup, the gastrula- mouth or
blastopore (Gast ... The resemblance of the gastrula to a simplified Hydra, ..."
3. Elementary Text-book of Zoology by Carl Claus, Adam Sedgwick (1884)
"The two-layered gastrula is, as a rule, developed from the blasto- sphere by ...
This mode of formation of the gastrula, which is very common, is found, ..."
4. The Evolution of Man: A Popular Exposition of the Principal Points of Human by Ernst Heinrich Philipp August Haeckel (1903)
"Fio. 26. Fio. 27. E Fio. 23. Fio. 2R Fio. 23.—(A) gastrula of a Zoophyte ...
(After Alexander Agassiz.) Fio. 2fi.—(D) gastrula of an ..."
5. Elementary Text-book of Zoology by K[arl] Claus, F. G. Heathcote, Carl F. Claus (1884)
"This mode of formation of the gastrula, which is very common, is found, eg, in
Ascidians, ... More rarely the gastrula arises by determination. ..."
6. Vertebrate Embryology: A Text-book for Students and Practitioners by Arthur Milnes Marshall (1893)
"The two layers of cells of which the wall of the gastrula consists are the two
primary germinal layers. The outer Layer is spoken of as the epiblast. ..."
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