A blastula arising from cleavage that takes place at the surface of the ovum. Cf. pericytula, n., perigastrula, n., perimonerula, n., perimorula, n.
| 单词 | θ18866 |
| 释义 | the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > [noun] > blastula (5) periblastula1876 A blastula arising from cleavage that takes place at the surface of the ovum. Cf. pericytula, n., perigastrula, n., perimonerula, n., perimorula, n. macromere1877 A relatively large blastomere, formed by unequal division in the fertilized ovum, and usually appearing at the vegetal pole. micromere1877 A relatively small blastomere formed by unequal segmentation in the fertilized ovum, such as one of those found at the animal pole of an amphibian… blastula1887 An embryo, typically composed of cells arranged in a sphere enclosing the blastocœle. amphiblastula1888 a blastula composed predominantly of two different cell types, which constitutes a free-swimming larval form in certain sponges. |
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