Keywords : Goat placentome
journal of kerbala university,
Volume 11, Issue 4, Pages 95-102
As part of working on the normal histology of the placenta of goat, the present work was aimed to presents normal modification and fate of maternal stromal cells of the pregnant endometrium which were in a form of fibroblast like cells. Fifteen pregnant goat's uteri were collected representing early pregnancy (day 20), mid pregnancy (days 66 and 85), and late pregnancy (days 100 and 125). Sample for light microscopy were fixed in Karnovsky's fluid and embedded in resin; semithin sections were stained with 1% toluidine blue.
Few days after implantation at day 20 there was no pronounced modification in the maternal endometrial stromal cells. The actual changes happened after the penetration of the fetal chorionic villi deep into endometrium which was represented by caruncles. The climax of modification was seen in the present work at day 66 of pregnancy. The maternal stromal cells cytoplasm increased in size, their nuclei have euochromatin suggesting synthetic ability for them. Most of the cells were disposed between the maternal blood vessels and the synepitheliochorial layer. After the elapse of second half of pregnancy the maternal stromal cells vanished from the scene of the placentome, allowing too much needed reduction in the space for rapid feto-maternal exchange of material across the blood circulation of the two sides.