Morfologia da placenta canina

Abstract

The placenta of SRD dogs was studied through macro, microscopic anatomy and scanning electron microscopy, analyzing the maternal and fetal vascular systems. It was classified as complete annular zonary, endothelial and lamellar with marginal hematomas in the extension of the margins of the placental brace. The vascularization of the organ is carried out by funicular vessels, branches, central placental and other, chorionic placental. Ventrally to the fetus, the remnant of the highly vascularized yolk sac is evident, characterizing the ventral choriovitheline placenta. Marginal hematomas were considered blood lakes arranged in contact with the trophoblast giving blood leakage originating from the maternal vessels, determining erythrophagositis and iron endocytosis. Placental microvascularization determines the lamellar classification of the canine placenta. At the fetal maternal interface, there are fetal capillaries arranged in a basket shape and maternal capillaries in the form of '' tufts of hair '' interspersed with gaps