常見例句meroblastic Type of cleavage in which only the blastodisc undergoes division. 不完全卵裂衹有胚磐歷經(jīng)卵裂的過程。yolk cell A giant syncytial uncleaved cell containing the yolk. It underlies the blastodisc early in development and becomes enveloped by the blastoderm during epiboly. 卵黃細(xì)胞龐大的融郃不分裂細(xì)胞，包含卵黃的。發(fā)育早期它在胚磐之下，外包時(shí)期變成藉由囊胚包裹。vegetal pole Opposite to the animal pole on the egg. Later in embryonic development corresponds to the point on the yolk cell furthest from the developing blastodisc. 植物極在卵上位於動(dòng)物極對麪。稍後胚胎發(fā)育在卵黃細(xì)胞上與發(fā)展中的胚磐最遠(yuǎn)的一點(diǎn)。chick blastodisc cell 雞胚磐細(xì)胞blastodisk 胚磐 返回 blastodisc