Primordial germ cells came from pole cells and moved in two masses to the laterodorsal abdomen of embryo, and then were enveloped by mesoderm to form germinal ridge.
原始生殖细胞来自极细胞，分两团移至胚胎腹部侧背面，被中胚层细胞包裹，形成生殖脊。
In these cells, one's attention is drawn to the spindle pole, its nature, and function.
在这些细胞中，纺锤极的性质和功能是值得注意的。
The posterior region of the paired heartforming fields subsequently contributes myocardial precursor cells to the inflow region or venous pole of the heart.
对称的生心区后部促使心肌前体细胞形成心脏的流入区域或静脉极。
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