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How do the hypothalamus and pituitary gland regulate ovarian activity?

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Detailed cross-sectional illustration of a human ovary showing the stages of follicle development, ovulation, and corpus luteum formation, with labeled structures including primordial, primary, secondary, and mature follicles, a ruptured follicle releasing an ovum, and corpus luteum and albicans. An inset at the bottom shows the ovary's location in the female reproductive system.
ovary The steps of ovulation, beginning with a dormant primordial follicle that grows and matures and is eventually released from the ovary into the fallopian tube.

The hypothalamus and pituitary gland regulate ovarian activity through a complex feedback loop known as the hypothalamic-pituitary-ovarian axis.12

  • Hypothalamic Control: The hypothalamus initiates the cycle by secreting gonadotropin-releasing hormone (GnRH) in pulses. This process is influenced by the central nervous system, allowing reproductive cycles to adjust to environmental factors.21
  • Pituitary Response: GnRH stimulates the anterior pituitary gland to release two primary gonadotropins: follicle-stimulating hormone (FSH) and luteinizing hormone (LH).32
  • Ovarian Regulation: FSH promotes the growth and maturation of ovarian follicles, which in turn secrete estrogen. As estrogen levels rise, they exert a feedback effect on the pituitary and hypothalamus, reducing FSH output and triggering a surge in LH. This LH surge is the primary driver of [ovulation].312
  • Feedback Loop: Following ovulation, the corpus luteum produces progesterone, which inhibits further ovulation through negative feedback on the pituitary, ensuring that the reproductive system remains regulated.124