月经为生殖功能成熟的外在表现，呈周期性。每一月经周期，卵巢中卵子成熟，具有生殖能力。为此，月经周期又称生殖周期。生殖周期中卵巢的变化由下丘脑－垂体－卵巢分泌的生殖激素所调节，既往称女性内分泌，近年已明确主要为调节生殖功能，故称生殖内分泌。生殖周期中核心事 Menstruation is an external manifestation of reproductive maturity, was cyclical. Every menstrual cycle, the ovary in the egg mature, with reproductive capacity. To this end, the menstrual cycle, also known as the reproductive cycle. Reproductive cycle changes in the ovary by the hypothalamus - pituitary - ovarian secretion of reproductive hormones by regulation, previously known as female endocrine, in recent years has been clearly mainly for the regulation of reproductive function, so called reproductive endocrine. Reproductive cycle in the heart