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blastula
b l a s t u l a hex:#98;#108;#97;#115;#116;#117;#108;#97;
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- Blastula - n. - That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.
- Gastrula - n. - An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double-walled sac, with one opening or mouth (the blastopore) which leads into the cavity (the archenteron) lined by the inner wall (the hypoblast). See Illust. under Invagination. In a more general sense, an ideal stage in embryonic development. See Gastraea.