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Age-related transformations of muscovy duck lymph nodes parenchyma, including its zonal specialization, are directly related to the process of development and reduction of the lymph sinus system, which determines the mechanism of entry and distribution within the lymphoid tissue of nodes of antigens and other foreign components of lymph. The lymph nodes of the muscovy ducks are «intravascular» uptake of lymphoid tissue. As a result, unlike mammals, there are virtually no capsular trabecules in the lymph nodes in birds, and due to the fact that the number of lymphatic vessels is often limited to one afferent and, accordingly, efferent vessel, between which, within the parenchyma of the node, central lymph sinus is located, characteristic subdivision of the lymphoid parenchyma for cortical and medullary substance is absent. The general pattern of quantitative correlation of the two main tissue components, connective-tissue stroma and lymphoid parenchyma of the cervicothoracic lymph nodes of muscovy ducks is a tendency to increase the percent area of the lymphoid parenchyma against the background of a decrease in the corresponding index of connective-tissue stroma. Formation of the complete complex of morphological features of immunologic reactivity in the lymph nodes of the muscovy ducks occurs during the first three months of postnatal ontogenesis: in the first stage (up to

MORPHOGENESIS OF THE PARENCHYMA AND INTRANODE LYMPHATIC BED OF LYMPH NODES OF MUSCOVY DUCK