mes.o.mere
n.（名词）A blastomere of intermediate size, larger than a micromere but smaller than a macromere.中分裂球：中等尺寸的分裂球，大于小分裂球而小于大分裂球The middle zone of the mesoderm of a chordate vertebrate embryo, from which excretory tissue develops.中胚叶节：脊索类脊椎动物胚胎的中胚层的中间部分，最终会发育成排泄组织
