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blastula ... blastopore-site of gastrulation initiation and later the opening of the archenteron at the vegetal region of certain embryo s (e.g., echinoderm and amphibian); in deuterostome embryo s it is the future anus of the organ ism.t. Louis, MO. C. V. Mosby ... blastopore [Gr. blastos-germ, bud, shoot; L. porus-a pore or passage]. The opening between the archenteron and outside of the embryo, formed by invagination during gastrulation. In some organ isms, it becomes the anus.