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Medical Definition of Blastodermic vesicle
1. In mammalian development, cleavage produces a thin walled hollow sphere, whose wall is the trophoblast, with the embryo proper being represented by a mass of cells at one side. The blastocyst is formed before implantation and is equivalent to the blastula. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)