Morgun L. Blood vessels cloacal bursa chickens, geese and ducks

The dissertation work is dedicated to the research of the blood vessels of the cloacal bursa chickens, geese and ducks. It is well known that blood flows cranial to the chickens, geese and ducks cloacal bursa by cranial, left and right lateral arteries, and flows back by homonymous veins. The cranial artery of cloacal bursa branches the sacrum part of descending aorta and enters its cranial part. Right and left artery branch from the right and left pudenda arteries and penetrate the cloacal bursa on the relevant surfaces. Geese and ducks cranial vein enters mesenteric vein caudally, and the chickens - the middle caudal vein. Cloacal bursa right and left lateral veins enter pudenda veins. Outside blood vessels have not the samemorphometric parameters. The peculiarity of the structure is the muscular type walls. Intraorganic blood vessels are represented by arteries, arterioles, capillaries, venules and veins that are located in all membranes of cloacal bursa. They have different morphometric parameters and architectonics. The greatest density of capillaries location registered in the mucosa membranes and the smallest - in the serous membranes. Among the abovementioned birds chickens have the most closely located capillaries and the ducks have the least.