Significados de real blastula em inglês

The round cavity, filled with fluid, inside the real blastula is the segmentation-cavity.

This real blastula only differs from that of the primitive ova in its chemical composition.

Formerly this real blastula was generally believed to be equivalent to the embryonic vesicle of the mammal.

What is called the "blastula" of the mammal and the real blastula of the amphioxus and many of the invertebrates are totally different embryonic structures.