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.

• 卵黄细胞庞大的融合不分裂细胞，包含卵黄的。发育早期它在胚盘之下，外包时期变成藉由囊胚包裹。