Abstract
The results of pathomorphological and morphometric studies showed that the histostructure of the normal placenta in cows in the last stages of gestation was characterized by the following features: - free location of the chorionic villi in the crypts formed by the branches of the uterine septa; - the composition of the intercellular substance of the uterine septa includes neutral mucopolysaccharides, chorionic villi - acid mucopolysaccharides. Histological examination of the placenta of cows during pregnancy complicated by preeclampsia revealed certain patterns in the structure of the organ, which can be taken into account in differential diagnosis: - a decrease in the mass of fetal membranes, as well as a decrease in the number and surface area of cotyledons; - hyperplasia of the crypts with simultaneous reduction of the villi, the crypts merged with each other, forming structures resembling the endometrium in structure; - vacuolar degeneration of chorionic villi in the fetal part of the placenta; - premature degradation of the extracellular matrix, not associated with labor activity.
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