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。
腔囊胚
双语例句原声例句
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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.
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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.
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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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