Coronary type of blood supply to the calf's heart

Abstract

The high variability of branching of the heart vessels in animals is a proven and irrefutable fact in veterinary morphology. In individuals of the same species and breed, quite high discrepancies can sometimes occur in the topography of the coronary arteries of the heart. When studying the coronary bed of the heart of animals, we recorded a case of the presence of a right-handed type of blood supply in a two-month-old Blackand- White calf in the absence of a left coronary artery. In this regard, we set ourselves the goal of studying the features of the vascularization of the right half of the heart in a two-month-old Black-and-White calf with a right-sided type of blood supply.
To achieve this goal, the heart of the corpse of a two-month-old Black-and-White calf, obtained from a private farm in the Leningrad Region, was studied. The study was conducted at the Department of Animal Anatomy, St. Petersburg State University of Veterinary Medicine. To study the vascularization of the heart of the studied animal, classical and modern anatomical techniques were carried out, such as fine anatomical preparation, photography, and the manufacture of corrosion preparations using latex.
According to the results of the study, it was found that in the absence of the left coronary artery in the studied two-month-old calf of the Black-and-White breed, the right coronary artery completely and completely compensates for its absence. The presence of the right interventricular artery was established, which has such branches as the artery of the right septomarginal trabecula and atrioventricular branches that supply blood to the tricuspid valve area and the right septomarginal trabeculae of the heart. It was determined that the vessels that vascularize the structures of the right atrium and right ventricle in their topography in the studied individual are inferior in the number of S-shaped bends and sharp corners in comparison with the arteries of the left half of the heart, which can reduce the risk of developing coronary pathologies in the right half of the heart. It was established that the subsinus artery differs from the generally accepted classical topography and plunges into the thickness of the myocardium of the right ventricle and interventricular septum, and practically does not pass as part of the subsinus sulcus.