Venous Outflow from the Uterus of the Oviduct in the Chicken of “Highsex White” Crossbreed
The venous system of the oviduct of birds is involved in regulating the constancy of blood pressure in the oviduct and in maintaining the level of metabolic processes in its departments. In the branching of the venous vessels of the right and left sides of the uterus of the oviduct, we note an asymmetry. From the uterus, venous blood flows through the cranial and caudal uterine veins, which independently flow into the caudal portal renal left vein. The craniolateral and caudodorsal fallopian veins, located on the left side of the uterus, are inserted into the cranial uterine vein. From the cranial part of the right side of the uterus, venous outflow is carried out along the craniolateral uterine right vein, which has 1.58±0.06 mm. It is located on the lateral surface of the uterus, and is divided into cranial and caudal branches. The cranial branch collects venous blood from the ventral surface of the isthmus, and flows into the ventral oviduct vein. The craniolateral uterine left vein, which has a diameter of 1.65±0.06 mm, is located on the cranioventral surface of the left side of the uterus, it bends in an arc, and seven or eight branches with a main type of branching flow into it. They are joined by convoluted branches of the III and IV orders. Venous outflow from the caudal part of the uterus is carried out through the caudal uterine vein, which is located on the dorsal edge of the uterus and flows into the caudal uterine vein, which also flows into the caudomedial, caudolateral, craniodorsal branches. From the dorsal surface of the uterus flows the dorsal fallopian vein, which flows into the mouth of the confluence of the right and left cranial fallopian veins.