QS Study

Ovulation is the process by which ovum is discharged with cumulous oophorus from mature graffian follicle into the peritoneal cavity. It is the process when hormone changes trigger an ovary to release an egg. You can only become pregnant if a sperm meets with and fertilizes an egg.

Regulation of ovulation is given following.

  1. In the adult female, higher brain centers impose, a menstrual cycle of 28 days upon the activity of hypothalamic GnRH.
  2. GnRH stimulates pituitary FSH and LH surge.
  3. FSH stimulates follicular development. Mature follicle secretes estrogen.
  4. Ovulation occurs due to LH surge.
  5. After ovulation corpus luteum formed. Corpus luteurm secrete progesterone and estrogen.
  6. Estrogen and progesterone inhibit FSH and LH secretion. So, prevent further ovulation.
  7. If fertilization fails to occur, corpus luteum degenerates; a new cycle begins further.

Fig: Feedback regulation of ovarian function 

Estrogen levels peak towards the end of the follicular phase. This causes a surge in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This lasts from 24 to 36 hours, and results in the rupture of the ovarian follicles, causing the oocyte to be released from the ovary.