近年来,对动情周期和月经周期中血浆内促性腺激素水平波动的本质,予以了极大的重视。大多数工作是把丘脑下部,特别是它的促垂体区和视前区作为类固醇反馈作用的主要部位。最近(1974)获得的证据指出,雌性大白鼠的垂体才是类固醇作用的主要部位,因在动情周期的不同时期,垂体的 In recent years, the estrus cycle and menstrual cycle plasma gonadotropin levels fluctuations in the nature of great attention has been given. Most work is the hypothalamus, especially its pituitary and preoptic areas as the main site of steroid feedback. The recent evidence (1974) shows that the pituitary gland of female rats is the main site of steroid action. Because of the different stages of the estrous cycle, the pituitary