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Distribution of the lymphatics and vascular changes caused by obstruction of the lymphatics in the aortic wall and periaortic tissues of dogs were investigated. By injecting India ink into the external iliac lymph nodes, the lymphatics in the aortic wall were observed in the superficial layer of the adventitia. Obstruction of the lymphatics in the aortic wall was produced by injecting a solution of gelatin.hydrocWoric acid into the external iliac lymph nodes. The dogs were divided into three groups. a) Ligated group Obstruction of the lymphatics and ligation of the illferior vena cava below the renal veins were performed. b) Not-ligated group Only the lymphatic obstruction was undertaken. c) Control group In general, accumulation of the interstitial fluids in the media, thickening of th~ intima and degeneration of the smooth muscle cells in the aortic wall were observed. At early phase, the ligated group showed more rapid and severe vascular changes than the not-ligated group. At late phase, no difference of changes was seen between the two group. Vascular changes were severe and lasted long in the region where granulation tissues increased markedly around the obstructed lymphatics. The above-mentioned facts suggest significance of the lymphatics related to vascular lesions. .

nagoya journal of medical science

An experimental study on the vascular lesions caused by disturbance of microcirculation in the aortic wall. Influence of obstruction of the lymphatics in the aorta and periaortic tissues.