出典:Wikipedia
出典:『Wikipedia』 (2011/05/29 22:23 UTC 版)
The blastula (from Greek βλαστός (blastos), meaning "sprout") is a solid sphere of cells formed during an early stage of embryonic development in animals. The blastula is created when the zygote undergoes the cell division process known as cleavage. The blastula is preceded by the morula and is followed by the gastrula in the developmental sequence.
名詞の変化形:
|