The compartments of the parenchyma of the lymph nodes in newborn bull calves of domestic cattle (Bos taurus)

Keywords: lymphoid lobules, deep cortex units, paracortical and medullary cords, lymphoid nodules


The article analyzes the features of the structure of the lymphoid lobules of the parenchyma of the superficial somatic (Limphonodi subiliaci, L. cervicales superficiales), profund somatic (L. axillares proprii L. poplitei), somatovisceral (L. iliaci mediales, L. retropharyngei mediales) and visceral (L. mediastinales caudales, L. ileocolici) lymph nodes of newborn bull calves of domestic cattle. To visualize clearly the boundaries of the structural components of lymphoid lobules we used the author’s modification of the impregnation of total median frozen histological sections with silver nitrate. We have established a high level of tissue differentiation of the lymph nodes, a significant development of the lymphoid parenchyma, the division of the parenchyma into lymphoid lobules, the presence in the lobules of all the main structural components that are represented by two morphotypes. The first morphotype is ribbon-like perisinusoidal cords (interfollicular zone, paracortical and medullary cords). The second morphotype is rounded lymphoid formations (central zones of deep cortex units, lymphatic nodules). Lymphoid lobules are located along the marginal sinus in one row, they are better developed and differentiated in the visceral lymph nodes. In all the lymph nodes, the lymphoid lobules have a similar histoarchitectonic, and each structural component of the lymphoid lobules has a specific architectonic of the reticular meshwork and the density of the location of the fibroblastic reticulocytes. We determined that the structures of the first morphotype which provide the migration of lymphocytes, the detection of antigens and the accumulation of plasmocytes are more developed. We have established that the relative volume of structures of the first morphotype is 4.5–8.0 times larger than the volume of the structures of the second morphotype, which provide clonal proliferation of T and B lymphocytes, especially in deep somatic lymph nodes. Among the zones of the second morphotype, predominate T-dependent zones, the relative volume of which considerably exceeds the volume of B-dependent zones (lymphoid nodules): in the superficial somatic lymph nodes by 14–30 times, profound somatic by 12–14 times, somatovisceral by 6–7 times and visceral by 4.5–5.5 times. We determined that lymphatic nodules can form in different parts of compartments: in the interfollicular zone and paracortical cords of all lymph nodes and in the medullary cords of the visceral lymph nodes. The study shows that the parenchyma of the lymph nodes of newborn bull calves has a high degree of maturity, contains a full set of structural markers of immunocompetence, among which predominate the components that support lymphocyte migration, antigen detection and accumulation of plasma cells.


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How to Cite
Gavrilin, P. N., GavrilinaО. G., & KravtsovаM. V. (2017). The compartments of the parenchyma of the lymph nodes in newborn bull calves of domestic cattle (Bos taurus). Regulatory Mechanisms in Biosystems, 8(2), 169-178.