Varieties of atypical lymph nodes of water deer (Hydropotes inermis argyropus)

Abstract

Abstract The morphology and topography of atypical lymph nodes of Korean water deer (Hydropotes inermis argyropus) is described for the first time. The aim of this work was to study the structural organization of atypical lymph nodes in water deer. Fresh organ samples were taken from 5 adult water deer. Samples are fixed in formalin and embedded in paraffin wax (Hystomix). Stain serial sections, 4-5 μm thick, are stained with hematoxylin-eosin, Masson’s trichrome stain, Gomori’s silver impregnation stain. Atypical lymph nodes in Korean water deer are located on the trachea along the jugular vein and under the trachea on the internal carotid artery and internal jugular vein. The nodes are localized on the adipose tissue of the pericardium in the thoracic cavity, as well as directly on the aortic arch. In the abdominal cavity, nodes are located along the caudal cava and abdominal aorta, as well as in the connective tissue layers of the pancreas. Organs have a dark red color, oval or round shape, its size - from millet grain to peas. Atypical lymph nodes are heterogeneous organs that differ not only from the usual lymph nodes, but also from each other, both in the type of bringing vessels and some features of the structure. Based on a detailed morphological study, atypical lymph nodes in the abdominal cavity were subdivided into 3 types: 1) hemolymphatic nodes; 2) venous hemal nodes and 3) arterial hemal nodes.