Antrum enlarges - inc. FSH - stimulates the development of the ovarian follicle and secretion of estrogens form the follicle. LH- stimulates further development of follicle, Tim. 10-20 follicles develope. Results in decrease in blood FSH levels Only one follicle continues .
Corpus secretes significant amounts of progesterone .
This hormone helps to maintain the uterus. This decline causes no further development of ovarian follicles. The hypothalamus is released form inhibitory control of the progesterone, GnRH is released and FSH and LH levels begin to rise. New cycle is initiated. The menstrual cycle Uterine cycle - the series of changes which occur in the endometrium of the nonpregnant female.