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[Scanning electron microscopic observations of the luminal surface of the rat uterus in the process of implantation and its hormonal regulation].

In order to study the real ultrastructural changes and the hormonal regulation in the process of the implantation, scanning electron microscopic observations were made on the endometrial surface of delayed implantation and castrated rats. 1) In delayed implantation, many large cellular protrusions, dense arrangement of microvilli and several microapocrine-like structures were observed. 2) Around eight hours after the injection of estradial, which dose was enough to induce the implantation, features such as a lot of macroapocrine-like and microapocrinelike structures, bulging of the cellular surface suggested the increase of secretion. Subsequently, the decrease of the secretion activity was implied from such features as wrinkling of the cellular protrusions, shortening or bending of the microvilli, and flattening of the cellular surfaces. 3) In the castrated rats, the microvilli were short and sparsely distributed. Under the administration of progesterone in these rats, microvilli were arranged densely and a large cellular protrusion was distributed on every cell. In contrast, at twelve hours after the administration of estradiol in these rats, many microapocrine-like structures were observed. Moreover, under the sequential administration of progesterone and estradiol, these findings well resembled those with estradiol injection in delayed implantation. 4) The significance and relation of those ultrastructural changes with the ovumimplantation were dicussed. (See pp. 811..827)