gastrula
Kelime Anlamı :
1. embriyo gelişim evresi.
2. Embriyonun gelişmesinde blastula devresini takip eden ve iç ve dış iki tabaka ve bir boşluk arzeden safha.
Tanımlar :
1.
an embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.
from The American Heritage® Dictionary of the English Language, 4th Edition
1.
A stage in the development of embryos of most animals consisting of a two-layered sac of ectoderm and endoderm.
from Wiktionary, Creative Commons Attribution/Share-Alike License
1.
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.
from the GNU version of the Collaborative International Dictionary of English
1.
in embryology, that form of the germ of the metazoa which is a germcup of which the walls consist of two layers.
2. it is the result of that process of invagination which occurs in most animals, whereby a vesicular morula, blasto-sphere, or blastula is converted into a cup-like two-layered germ, with a blastopore or orifice of invagination, and an endoderm or membrane inclosing a primitive intestinal cavity, the endoderm itself being inclosed within an ectoderm. the word enters into many loose compounds of obvious meaning, as gastrula-body, -cup, -form, -formation, -germ, -mouth, -stage, -stomach, etc., mostly derived from the translation of the german compounds used in Haeckel's works. see gastrulation.
2. it is the result of that process of invagination which occurs in most animals, whereby a vesicular morula, blasto-sphere, or blastula is converted into a cup-like two-layered germ, with a blastopore or orifice of invagination, and an endoderm or membrane inclosing a primitive intestinal cavity, the endoderm itself being inclosed within an ectoderm. the word enters into many loose compounds of obvious meaning, as gastrula-body, -cup, -form, -formation, -germ, -mouth, -stage, -stomach, etc., mostly derived from the translation of the german compounds used in Haeckel's works. see gastrulation.
from The Century Dictionary and Cyclopedia