Scanning electron microscopic studies upon daily changes of the endometrium of earlier stage of attachment in pregnant swine.

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Morphological daily changes in the endometrium of the earlier stage of attachment from the pregnant swine were examined histologically using light and scanning electron microscopes (SEM). On the 7th day after mating (the stage of intrauterine migration), a wavy swelling made by pseudostratified epithelium was observed as islets by SEM. On the 11th day (the filamentous blastocyst stage), the wavy structures were disappeared and the surface of the epithelial cells was covered with numerous microvilli like a carpet. On the 13th or 14th day (the adhesion stage), the epithelial cells showed a marked dome-like protuberance. The microvilli were short and thick and decreased in number. On the 17th or 18th day (the early attachment stage), the apical protrusions of the individual epithelial cells revealed balloon-like structures and most of the microvilli were disappeared. The chorionic cells inserted their long microvilli into the intercellular space of the maternal epithelial cells. On the 22nd or 23rd day (the attachment stage), the epithelial cells became larger and the surfaces were densely covered with short microvilli again.
日本繁殖生物学会の論文