ANATOMICAL AND HISTOLOGICAL FEATURES OF THE REGIONAL STOMACH LYMPH NODES IN DOGS

The paper describes the local features of the regional lymph nodes of the stomach in dogs. Research was carried out at the Khakass State University named after N.F. Katanov (Republic of Khakassia) on autopsy and biopsy material obtained from 34 male and female healthy outbred dogs aged 2 to 6 years. In the course of the study, the methods of intratissue injection of the lymphatic bed with colored dyes, preparation, making stained total preparations from the capsule of the lymph nodes, histological sections, light and electron microscopy were used. The regional lymph nodes of the stomach in dogs are gastric, pancreaticoduodenal, splenic, and hepatic lymph nodes. Regional lymph nodes of the stomach in dogs have a typical structure for these organs. The contractility of the capsule of the lymph nodes is determined by the quantitative and spatial distribution of smooth myocytes of its middle layer, which have local features. In the zone of muscle strands, myocytes lay in strands in several layers and were oriented along the course of attachment of the trabeculae. In the rarefaction zone, myocytes lay singly or in bundles of 2–3 cells and oriented in different directions, intersecting with each other. The depositing ability of the capsule of the lymph nodes of the stomach in dogs also has local features and is determined by the quantitative and spatial distribution of collagen and elastic fibers, as well as the presence of "reserve" folds in them. The largest number of myocytes and connective tissue fibers were detected in the zone of muscle-connective tissue cords, fewer myocytes and connective tissue fibers were detected in the zone of capsule rarefaction. Most myocytes were found in the capsules of the pancreas-duodenal lymph nodes, and the capsules of the hepatic lymph nodes contained a smaller number of myocytes relative to all regional gastric lymph nodes in dogs.