In a young female of reproductive age with regular menstrual cycle of 28 days, ovulation occurs at around 14th day of periods. When is the first polar body extruded?
Primary oocyte remain in prophase of meiosis I until primodial follicle grow to form primary follicle which grows to form secondary/graffian follicle. The secondary follicle enters preovulatory stage 36 hrs before ovulation when LH surge occurs resulting in completion of meiosis -I and formation of secondary oocyte and 1st polar body 12hrs prior to ovulation(LH peak occurs).
12 hrs prior to ovulation
Accompanied by ovulation
48hrs after the ovulation
At the time of ovulation
Introduction and gametogenesis.