LH - Luteinizing hormone
FSH - follicle stimulating hormone
GnRH - Gonadotropin-releasing hormone
oogeneis
- GnRH from the hypothalamus is produced which stimulates production of FSH. FSH stimulates development of primary follicle in the ovary
- follicle stimulates oestrogen. Oestrogen stimulates repair and thickening of endometrium and inhibits secretion of LH and FSH
- GnRH is produced which produces a 'surge' of LH and FSH to stimulate ovulation (release of secondary oocyte from ovarian follicle) at around day 14. LH stimulates development of corpus luteum from the remains of the ovarian follicle
- corpus luteum secretes progesterone and reduces oestrogen production. low levels of oestrogen reduces FSH and LH production
- corpus luteum secretes oestrogen and progesterone. progesterone stimulates glandular activity in endometrium and oestrogen helps maintain its thickness. This high level of progesterone inhibit GnRH, LH and FSH production
- if egg is not fertilzed, corpus luteum degenerates. oestrogen and progesterone is decreased and lining of the uterus breaks down (menstruation) . FSH is no longer inhibited so FSH stimulates formation of new primary follicle
