A i.e. 24 hours prior to ovulationEvent In OogenesisTime periodMaximum number of germ cell (Oogonia & few oocyte) - 7 million are found by5th month (prenatal)All oogonia become atretic and only primary oocyte surrounded by follicular cell (k/a primordialfollicle) remain by7", month (prenatal)All primary oocyte have staed prophase of meiosis I, but instead of proceeding into metaphase,they enter diplotene stageNear the time of bihPrimary oocyte remain in prophase of meiosis I untilPubeyPrimordial follicle (with primary oocyte) grow to form primary/ preantral- follicle, which grows intosecondary / vesicular / Graffian- follicle. The 2deg follicle enters preovulatory stage - 36 hours beforeovulation (when LH surge occurs) resulting in completion of meiosis I and formation ofsecondary oocyte and 1st polar bodyQ- 36 hours before ovulation2deg oocyte enters meiosis 11 but arrests in metaphase- 3 hours before ovulationMeiosis II is completed with formation of ovulin and 2" polar body only ifFeilization occursWithout feilization 2deg oocyte degenerates with in- 24 hours after ovulation