THE STRUCTURE OF CRANIAL MESENTERIC LYMPH NODES OF NEWBORN RATS

Abstract

Introduction. Mesenteric lymph nodes in rats are constantly found, have relatively large sizes, a diverse shape and are located in groups of 2–3 nodes. Mesenteric lymph nodes are the largest and most numerous, they are located in the duplication of the peritoneum along the cranial mesenteric artery and its branches. Among them, the central and peripheral nodes can be distinguished. The purpose of this study was to determine the topographical features of the cranial mesenteric lymph nodes of newborn rats under normal conditions. Materials and methods. The study of cranial mesenteric nodes was performed on 56 newborn rats obtained from 5 female mongrel white rats of seven months of age. Results. In newborn rats that developed under physiological conditions, the total number of cranial mesenteric lymph nodes (CBLS) is 9.33±0.12. The number of CBLS located proximally from the beginning of the iliac-colon artery ranges from 3 to 6 and averages 5.71±0.18. The number of KBLU in the mesentery of the small intestine, located along the continuation of the cranial mesenteric and iliac-colon arteries, varies from 1 to 5, while their average number is 2.52±0.20. In the area of the ileocecal angle on the inferior medial surface of the cecum or in the iliac-colon ligament, at some distance from the angle, there is usually 1, less often 2 nodes (1.10±0.09). The ratio of the total area of the KBLU groups on the longitudinal median sections is, respectively 2,99:2,11:1,00 (3:2:1). Conclusion. Cranial mesenteric lymph nodes of newborn rats have a high degree of polymorphism, morphometric parameters and degree of maturity. The most morphologically mature cranial mesenteric lymph nodes are determined in the area of the initial segment of the cranial mesenteric artery and its branches, proximally from the beginning of the iliac-colon artery, and are also located along the last and continuation of the cranial mesenteric artery (I and II topographic groups), and the least mature — in the area of the ileocecal angle (III topographic group).