blastoderm

/blas-tuh-durm/US // ˈblæs təˌdɜrm //UK // (ˈblæstəʊˌdɜːm) //

胚胎,胚胎细胞,胚层,胚胎层

Definitions

n.名词 noun

1
Embryology.
- : the primitive layer of cells that results from the segmentation of the ovum.
- : the layer of cells forming the wall of the blastula, and in most vertebrates enclosing a cavity or a yolk mass.

For hardening the blastoderm I have employed, as usual, chromic acid, and also gold chloride.
If the outlines only of the cells are to be examined, a very short immersion (half a minute) of the blastoderm in a half per cent.
My observations begin with the blastoderm of a freshly laid egg.
The changes which the blastoderm undergoes during the first three or four hours of incubation are not very noticeable.
I have already spoken of the gradation of the hypoblast at the edge of the blastoderm into white yolk.