摘要
用透射电镜观察和比较了交配后4～7天兔胚泡的内细胞团细胞细微结构的变化。结果表明,交配后5天胚泡中的内细胞团细胞排列成单层,并在内侧出现原始内胚层以后,内细胞团细胞开始分化。我们的观察显示,兔胚泡的原始内胚层不是由内细胞团分层形成,而可能是由分散在胚泡壁滋养层内侧、形态与内细胞团细胞相似的一些细胞衍生而成。本文并对极滋养层的断裂和消失全过程进行了描述和讨论。
Ultrastructural changes of the inner cell mass (ICM) in rabbit blastocysts from 4 to 7 days post coitum (p.c.) were observed with transmission electron microscope. It revealed that ICM of blastocyst on day 5 p.c. began to differentiate after they were arranged into a single layer, and under which the primitive endoderm appeared. It is suggested that the primitive endodermal cells in rabbit blastocysts are derived from the scattered ICM-like cells at the inner surface of the mural trophoblast rather than delaminated from ICM proper. In this paper, disruption and disappearance of polar trophoblast are described and discussed.
出处
《解剖学报》
CAS
CSCD
北大核心
1991年第2期220-224,I019,20,共7页
Acta Anatomica Sinica
基金
国家自然科学基金
美国洛氏基金
关键词
胚泡
内细胞团
原始内胚层
兔
形态
Blastocyst
Inner cell mass
Primitive endoderm
Polar trophoblast
Rabbit
