[Lymphoid tissue during phylo- and ontogenesis]

In the process of evolution lymphoid tissue is isolated from the single hemolymphatic system as central and peripheral organs of the immune system. However there remains a close relationship between the lymphoid and myeloid tissues in the forms of perivascular lymphoid accumulations in organs both in the phylo- and ontogenesis. In mammals and man the diffusely disseminated within the body perivascular lymphoid tissue if differentiated in organoid-perivascular lymphoid follicles which are regularly located along the course of links of the hemo- and lymphocirculatory bed.