Abstract
The dynamics of mass and linear parameters of lymph nodes of ducks is a direct reflection of structural and functional transformations of their lymphatic parenchyma. The peculiarities of quantitative dynamics of tissue components of peripheral lymphatic organs at early stages of postnatal ontogenesis are to a great extent determined by advanced growth rates of their absolute mass against the background of sharp increase of their antigenic stimulation intensity. Parenchyma of lymph nodes of newborn ducklings is characterized by relatively low degree of differentiation and is represented by diffuse lymphatic tissue with no pronounced signs of its division into separate functional zones. Internally, the lymphatic channel is represented by only two lymphatic sinuses - the central one, which is located in the central part of the organ and occupies a large relative area and a discrete edge sinus, which borders on the node capsule and has a much smaller relative area and, accordingly, is located at its periphery. The organ parenchyma is a diffuse cluster of stromal and lymphatic cells in the enlarged lymphatic vessel between the central (inner) and edge (outer) lymphatic sinuses, without signs of its division into cortical and brain matter. Among the lymphatic tissue of the lymph node, reticular stroma cells and the population of small lymphocytes have the largest relative amount.
Highlights
Lymph node is one of the most modern forms of development of lymphatic structures in vertebrate animals
Stroma of lymph nodes of newborn ducklings is represented by a dense unformed fibrous fabric that consists of a capsule and a few trabecule, its relative area is 29.17 ± 0.78%
The population of lymphatic cells is incomplete due to the absence of plasmocytes, and most of it is represented by small lymphocytes
Summary
Lymph node is one of the most modern forms of development of lymphatic structures in vertebrate animals. Cytotypes and organotypes of the stages of phylogenetic formation of lymphoid tissue and its immunoclitinoi reactivity have been studied in more detail, which is proved by the works of many authors (Borodin et al 1985; Krasnikov, 2000; Gavrilin, 2002). Another characteristic feature of the process of lymphatic tissue evolution is the appearance of lymph nodes in birds, but only in waterfowl representatives (Sugimura, Hashimoto, 1977; Berezina, 1998). The data on age-related transformations of bird lymph nodes typical only for waterfowl representatives of this class of vertebrates are especially scarce
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