Maternal Stromal Endometrial Cells of Pregnant Goat Uterus:A Light Microscopic Study

As part of working on the normal histology of the placenta of goat, the present work wasaimed to presents normal modification and fate of maternal stromal cells of the pregnantendometrium which were in a form of fibroblast like cells. Fifteen pregnant goat s uteri werecollected representing early pregnancy (day 20), mid pregnancy (days 66 and 85), and latepregnancy (days 100 and 125). Sample for light microscopy were fixed in Karnovsky s fluid andembedded in resin; semithin sections were stained with 1% toluidine blue. Few days after implantation at day 20 there was no pronounced modification in thematernal endometrial stromal cells. The actual changes happened after the penetration of the fetalchorionic villi deep into endometrium which was represented by caruncles. The climax ofmodification was seen in the present work at day 66 of pregnancy. The maternal stromal cellscytoplasm increased in size, their nuclei have euochromatin suggesting synthetic ability forthem. Most of the cells were disposed between the maternal blood vessels and thesynepitheliochorial layer. After the elapse of second half of pregnancy the maternal stromal cellsvanished from the scene of the placentome, allowing too much needed reduction in the space forrapid feto-maternal exchange of material across the blood circulation of the two sides.