The terms " gastrula " and " gastrulation " were coined by Ernst Haeckel, in his 1872 work " " Biology of Calcareous Sponges " ".
22.
During the gastrula stage, once the blastopore has formed, the PMCs are localized within the prospective ventrolateral ( from front to side ) region of the blastocoel.
23.
All bilaterian animals at an early stage of development form a gastrula, which is polarized, with one end called the animal pole and the other the vegetal pole.
24.
In these three phyla of organisms, the mesoderm ( the middle germ layer ) forms as a solid mass of migrated cells from the single layer of the gastrula.
25.
The stage starts with the gastrula; as the archenteron forms, pockets of migrating cells also form, creating another layer between the endoderm and ectoderm, the mesoderm.
26.
Transplant experiments show that only at the late gastrula stage are these cells committed to the paraxial fate, meaning that fate determination is tightly controlled by local signals and is not predetermined.
27.
:: There's also fertilization, zygote, implantation and gastrula, as well as several hundred other relevant concepts . talk ) 02 : 10, 3 December 2012 ( UTC)
28.
The defining characteristic of the deuterostome is the fact that the blastopore ( the opening at the bottom of the forming gastrula ) becomes the anus, whereas in protostomes the blastopore becomes the mouth.
29.
During the blastula and gastrula stages, vegetal cells ( the presumptive endoderm ), release signals to marginal zone cells resulting in the induction and patterning of the mesoderm ( 1, 8 ).
30.
Importantly, unshelled embryos ( blastula, gastrula and trochophore stages ) were not found in snails > 16 mm and the numbers of shelled embryos themselves decreased in the largest snails, > 24 mm.
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