Abstract
In this scientific research, morphological changes characteristic of the
lymphocytopoietic function of regional lymph nodes in cystitis and pyelonephritis were
studied. If in the initial period of the disease the barrier and drainage function of lymphatic
vessels and regional lymph was increased, over time it is observed that B-lymphocytic
lymphocytopoietic function prevails in regional lymph nodes. In the morphological aspect,
the lymphocytopoietic function is confirmed by activation and increase by proliferation of
lymphoid and macrophage cells in the cortical layer of lymph nodes.