The change of blood picture in nutrient vessel of femur was examined after the lumbal sympathectomy of rabbits and the results obtained were as follows: 1) Promoted cell outswim of erythrocytes and reticulocytes. 2) Promoted cell outflow of pseudoeosinophils especially staff cells. 3) Can be cases of macroscopic dilatation of the vessel. 4) Increased blood stream volume. The above concludes that the interception of sympathic nerve of rabbits dilates the intramedullary vessels, and promotes those blood streams, cell outflow from the bone marrow.