Sphere of cells formed during early embryonic development in animals.
1 E stage with thirty-two cells; F blastula ; G gastrula in longitudinal section.
2 The round cavity, filled with fluid, inside the real blastula is the segmentation-cavity.
3 The latter ( blastula ) is palingenetic, and precedes the formation of the gastrula.
4 Also, in every case, the gastrula develops from the blastula by curving or invagination.
5 This real blastula only differs from that of the primitive ova in its chemical composition.
6 We call this layer the blastoderm, and the sphere itself the blastula , or embryonic vesicle.
7 A blastula , with wide embryonic cavity (blastocoel, bl), g incipient invagination.
8 Sagittal section of a hooded-embryo (depula) of triton ( blastula at the commencement of gastrulation).
9 Longitudinal section of the blastula of a shark (Pristiurus) at the beginning of gastrulation.
10 Vertical section of the blastula of a hen (discoblastula).
11 Longitudinal section through the blastula of a shark (Pristiuris).
12 Formerly this real blastula was generally believed to be equivalent to the embryonic vesicle of the mammal.
13 Embryonic vesicle of triton ( blastula ) , outer view, with the transverse fold of the primitive mouth (u).
14 From it is developed in the same manner in all the Placentals, by repeated cleavage, a multicellular blastula .
15 The frog-embryo now represents a modified embryonic vesicle or blastula , with hollow animal half and solid vegetal half.
16 This interesting blastula is very important.
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