blastoderm's Usage Examples:

von Kolliker described the formation of the blastoderm in the egg of the midge Chironomus.

by tangential division of the cells of the blastoderm, as in Geryonia, or by a mixture of immigration and delamination, as in Hydra, Tubularia, 'c.

- The embryo begins to develop as an elongate, thickened, ventral region of the blastoderm which is known as the ventral plate or germ band.

stated that in the Muscidae, while the anterior endoderm-rudiment The embryo is invaginated into the yolk, but the surface edges of arises as Kowalevsky had observed, the posterior part of the " midthe blastoderm do not close over, so that a groove or pore puts gut " has its origin as a direct outgrowth from the proctodaeum.

fore and hind endodermal rudiments arise from the blastoderm by Head Segments.

This by successive divisions forms a group of four to eight cells, which subsequently pass through the blastoderm, and dividing into two groups become symmetrically arranged and surrounded by the rudiments of the ovarian tubes.

These two endoderm-rudiments embryonic membrane formed by delamination from the blastoderm, ultimately grow together and give rise to the epithelium of the midwhile in a few insects, including the wingless spring-tails, the emgut.

The segmentation of the fertilized nucleus results in the formation of a number of nuclei which arrange themselves around the periphery of the egg and, the protoplasm surrounding them becoming constricted, a blastoderm or layer of cells, enclosing the central yolk, is formed.

Kowalevsky or a bug is invaginated into the yolk at the head end, the portion of (1871 and 1887) on the embryology of the water-beetle Hydrophilus the blastoderm necessarily pushed in with it forming the amnion.

Synonyms:

germinal area, germinal disc, layer, blastodisc,

Antonyms:

natural object,