[Morphological studies of the effects of progesterone on the adenohypophysis of the impuberal female rat].

At optical microscope and at electronic microscope it has been examined the adenohypophysis of Wistar albino impuberal female rats after administration of progesterone. It has come out that the progesterone influences in different ways the activity of pituitary gonadotropic cells (FSH and LH cells) according to the quantity and according to the way it affects either rapidly or within an extended period, on intact or on spayed animals, in the morning or in the afternoon. For what concerns the influence of the hormone, it has also come out to be variable as it may concern, according to the cases, a single or both cellular types, and it can appear with symptoms of secretion, with symptoms of excretion or with both symptoms. According to the verified data, the possible ways of action of progesterone on the hypothalamo-hypophyseal unit are discussed.