The direct effect of normal women of childbearing age endometrial function layer in ovarian hormone, uterine bottom and body function layer endometrium changes periodically, every 28 days or so once endarterectomy and bleeding and repair and proliferation process, called the menstrual cycle.
In each menstrual cycle, ovarian hormone influenced the pituitary secretion of a series of morphological and functional changes, including follicular development, maturation, ovulation and luteal cycle and estrogen and progesterone secretion.