论文部分内容阅读
Ⅰ:滤泡的数目和滤泡的初期生长女性性腺的早期发育特征是生殖细胞由胚胎后肠区呈丝状分裂快速地成群移动。在出生前的间期,由于某些不明信号的作用,快速丝状分裂活动停止,生殖细胞进入第一次减数分裂前期。这些初级卵母细胞在退化(占99％)或排卵释放以前继续休止在减数分裂前期。所以哺乳动物出生后卵巢内
Ⅰ: The number of follicles and initial growth of follicles The early development of female gonads is that germ cells rapidly move in groups by filamentous division in the hindgut region of the embryo. During the prenatal period, due to some unknown signals, rapid filamentous mitosis ceases and germ cells enter the first pre-meiotic phase. These primary oocytes continue to quiesce at the pre-meiotic stage until degeneration (99%) or ovulation release. So mammals are born after the ovary