The opening into the archenteron formed by invagination of the blastula to form a gastrula. SYN: protostoma, protostome. [blasto- + G. poros, opening]
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blas·to·pore 'blas-tə-.pō(ə)r, -.pȯ(ə)r n the opening of the archenteron
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n.
the opening that forms as a result of invagination of the surface layer of the early embryo (gastrula). It is very much reduced in humans, in which it gives rise to the archenteric canal (see archenteron).
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blas·to·pore (blasґto-por) [blasto- + pore] the opening of the archenteron to the exterior of the embryo at the gastrula stage; called also archistome, protostoma, and anus of Rusconi.Medical dictionary. 2011.