Lymph Tissue Open Access Articles
Lymphoid tissue has several different structural organizations associated with its particular function within the immune reaction . The most highly organized lymphoid
tissues are within the thymus and lymph nodes, which are well-defined encapsulated organs with easily identifiable architectures. In the
spleen (a soft, purplish organ lying high within the abdomen), the lymphatic tissue may be a cylinder of loosely organized
cells surrounding small arteries. In the bone marrow this tissue is mixed with the blood-forming cells, and no organization is obvious .Reticular
cells provide structural support, since they produce and maintain the skinny networks of fibres that are a framework for many lymphoid organs. Macrophages help eliminate invaders by engulfing foreign materials and initiating the immune reaction . These
cells could also be fixed in one place, like lymph nodes, or they'll wander within the loose connective-tissue spaces. The most common cell type within the lymphatic tissue is that the lymphocyte. Like macrophages, lymphocytes are formed from stem
cells within the bone marrow then circulated within the blood to the lymphatic tissue . T lymphocytes mature in the thymus before proceeding to the other lymphoid organs, such as the spleen. B lymphocytes mature in the bone marrow and proceed directly to the lymphoid organs. Both kinds play a key role in immune responses to infectious microorganisms.
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