However , the oocytes will arrest the first meiosis at prophase in their follicles . after a long development and acquiring the meiotic resumption competence , oocytes in preovulatory follicles will resume meiosis to mature under the stimulation of preovulatory gonadotropins surge 卵母细胞减数分裂随之停滞于第一次减数分裂的前期，在卵泡中通过漫长的生长发育过程后，在一定的刺激条件下才恢复减数分裂而成熟。
