Ultrastructural organization of capillary endotheliocytes of the popliteal and iliac lymph nodes in the rat

: The popliteal and iliac lymph nodes have different regional specialization. The former belong to somatic lymph nodes, while the latter get lymph also from internal organs; this explains certain differences in their structural-functional organization. Some objective quantitative data have been obtained that characterize ultrastructure of blood capillaries in the rat popliteal and iliac lymph nodes under normal conditions of the organism's functioning. They demonstrate essential differences in the level of transendothelial transport and, hence, functional activity of these organs.