blastopore

[ blas-tuh-pawr, -pohr ]

Phonetic (Standard)IPA

noun

, Embryology.

blas·to·por·ic [blas, -t, uh, -, pawr, -ik, -, por, -], blas·to·po·ral [blas-t, uh, -, pawr, -, uh, l, -, pohr, -], adjective

1875–80; blasto- + -pore passage; pore ²

In other words, the position of the blastopore in the Selachian is not the same as in the Frog.

It is hardly possible to help believing that the blastopore primitively represented a mouth.

In Osseous Fishes the blastopore undergoes a similar change of position.

In the caudal region the medullary folds spread out and enclose between them the blastopore, behind which they soon meet again.

The mesoblast grows out from the lip of the blastopore as four masses.

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