In the lymphatic vascular system, it initiates the lymphatic capillaries that are tbulos of deep blind person that if they anastosomam to form pipes of continuously increasing diameter and that they finish finally in the sanguineous vascular system. The internal surface of all the sanguine and lymphatic vases is coated by an only layer of originated pavimentoso epitlio of mesnquima, called of endotlio. The circulation can be divided in macro-circulation with vases of 0,1mm of diameter and vases of the micron-circulation that only can be visible to the microscope, the vases of the micron-circulation is of great importance enters the flow of blood with surrounding fabrics, as much in normal conditions as in the inflammatory process. We will go to describe, therefore at great length each element that composes this vast system of form understands it its functional dynamics in the minimum details in accordance with the human necessities of the organism, is happened they of its natural physiological functions how much in the complex pathological system that involves these mechanisms with being main lines of diffusion of agents in the combat to invading antigens of small ratios or sistmica form. Small great sistmica circulation source: blogspot.com the Capillaries in accordance with Suffer to variations the metabolic exchanges for these exerted, are composites of an only layer of endoteliais cells that they are rolled in form of a pipe. The capillaries when they are parted transversally we can observe cells that rest in a basal blade, in general these cells are polygon and its axle if she guides in the direction of the flow of the blood, these cells if they laterally arrest the one others through a zone called occlusion, these play an important role in the physiology of this system, therefore they allow a changeable macro-molecule permeability that plays role in such a way importantssimo in normal or pathological situations.