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  • What role do pituitary gonadotropins play during follicular and ovulatory phases of the menstrual cycle. Explain the shifts in steroidal secretions?

What role do pituitary gonadotropins play during follicular and ovulatory phases of the menstrual cycle? Explain the shifts in steroidal secretions.

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Pituitary gonadotropins (FSH and LH) play a very vital role during the follicular and ovulatory phases of the menstrual cycle.

  • FSH stimulates the release of ovum from the Graafian follicle. It also stimulates the development and subsequent rupture of Graafian follicle. Thus, FSH plays a major role during the follicular and ovulatory phases.
  • The above figure shows varying levels of LH. FSH and steroid hormones during follicular and ovulation phases of the menstrual cycle.
  • At this stage, the level of estradiol (a steroid hormone) increases. This suppresses the level of Luteinizing hormone (LH). Once the level of estradiol reaches a threshold level, the effect is reversed.
  • After that, the level of estrogen (another steroid hormone) increases. This stimulates a surge in levels of LH. High level of L.H stimulates the development of corpus luteum and proliferation of the endometrium, thus, marking the beginning of the luteal phases.
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