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Pituitary Gland

Pituitary Gland. FSH. LH. Primordial follicles. Growing follicles. Pituitary Gland. -. FSH. Estrogen. inhibin. Growing follicles. Pituitary Gland. - +. Estrogen. LH. Growing follicles. Mature Graafian. Pituitary Gland. - +. Estrogen. LH. Corpus luteum

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Pituitary Gland

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  1. Pituitary Gland FSH LH Primordial follicles Growing follicles

  2. Pituitary Gland - FSH Estrogen inhibin Growing follicles

  3. Pituitary Gland - + Estrogen LH Growing follicles Mature Graafian

  4. Pituitary Gland - + Estrogen LH Corpus luteum ovulation Mature Graafian

  5. Pituitary Gland - Estrogen and progesterone LH Corpus luteum

  6. Pituitary Gland - Estrogen and progesterone Corpus luteum

  7. Pituitary Gland Corpus luteum Corpus albicans

  8. Pituitary Gland - Estrogen and progesterone If implantation occurs LH Corpus luteum

  9. Pituitary Gland - Estrogen and progesterone If implantation occurs Corpus luteum HCG (human chorionic gonadotropin) Placenta

  10. Uterine Cycle

  11. Menstrual Cycle Progesterone + estrogen Estrogen Menstrual Phase Proliferative Phase Secretory Phase Day 1 - 4 Day 15 - 28 Day 5 - 14

  12. Menstrual Cycle Decrease in Progesterone + Estrogen Progesterone + estrogen Estrogen Menstrual Phase Proliferative Phase Secretory Phase Menstrual Phase Day 1 - 4 Day 15 - 28 Day 1 - 4 Day 5 - 14

  13. Combined Ovarian and Uterine Cycle

  14. FSH is secreted by the pituitary FSH stimulates growth of some of the ovarian follicles The growing follicles produce estrogen and inhibin Estrogen (moderate level) and inhibin inhibits FSH release by the pituitary High Estrogen stimulates increase secretion of LH by the pituitary Estrogen also stimulates growth of the endometrium (proliferative phase) LH stimulates ovulation resulting in the formation of the corpus luteum LH stimulates the corpus luteum to develop, which includes estrogen and progesterone production

  15. Estrogen and progesterone inhibit FSH and LH release by the pituitary Estrogen and progesterone stimulates uterine gland secretion of glycogen and continued growth of the endometrium (secretory phase) Decrease in LH inhibits the corpus luteum resulting in a decrease in estrogen and progesterone and deterioration of the corpus luteum, forming the corpus albicans (scar tissue) Decrease in estrogen and progesterone causes vasoconstriction of uterine vessels resulting in menstruation With estrogen and progesterone levels low, FSH can again be released by the pituitary, beginning a new cycle

  16. Pituitary Gland FSH Primordial follicles Growing follicles Menstrual Phase Day 1--4

  17. Pituitary Gland - FSH Estrogen Growing follicles Estrogen Menstrual Phase Proliferative Phase Day 1--4 Day 5--14

  18. Pituitary Gland - + Estrogen LH Growing follicles Mature Graafian Menstrual Phase Proliferative Phase Day 1--4 Day 5--14

  19. Pituitary Gland - + Estrogen LH Corpus luteum ovulation Mature Graafian Menstrual Phase Proliferative Phase Day 1--4 Day 5--14

  20. Pituitary Gland - Estrogen and progesterone LH Corpus luteum Estrogen + progesterone Menstrual Phase Proliferative Phase Secretory Phase Day 15--28 Day 1--4 Day 5--14

  21. Pituitary Gland Corpus luteum Corpus albicans Decrease in Progesterone + Estrogen Menstrual Phase Proliferative Phase Secretory Phase Menstrual Phase Day 15--28 Day 1--4 Day 1--4 Day 5--14

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