囊胚呈球形,中间有明显的腔。进行完全均等卵裂的动物,如海胆与文昌鱼具有典型腔囊胚。进行完全不均等卵裂的两栖类囊胚,其植物极细胞较大,囊胚腔偏于动物极,囊胚壁细胞层数多。哺乳动物的囊胚属腔囊胚,又称胚泡。但其发育较特殊,桑椹胚细胞间形成的囊胚腔,又称胚泡腔;随后桑椹胚细胞分为围于外面的滋养层细胞和内部的内细胞团,二种细胞已有形态分化,将来发育方向也大不相同。
目的观察胚胎干细胞(ES细胞)囊胚腔注射的方法构建嵌合体小鼠自发性肿瘤。
Objective to study the spontaneous tumors derived in chimeric mice resulting from injection of embryonic stem (es) cells into host blastocysts.
解冻后,33枚胚胎中有26枚(大多数胚胎含有2到10个细胞)发育到囊胚阶段,此时囊胚腔已经形成。
After thawing, 26 of the 33 embryos (most of which were composed of between two and ten cells) developed to blastocyst stage in which the blastocoele is formed.
The cells of this cluster inside next to the fluid filled cavity is a region of the blastocyst called the inner cell mass.
而这簇细胞的内侧,毗邻于充满液体的空腔的一侧,这些细胞在囊胚中称为内群细胞
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