lymphoid organs


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lymphoid organs

The spleen, lymph nodes, thymus, Peyer patches, and tonsils, where more than 98% of T lymphocytes are found.
See: T cell
See also: organ

lymphoid

resembling or pertaining to lymph or to tissue of the lymphatic system.

bronchus-associated lymphoid tissue (BALT)
aggregations of B and T lymphocytes in the lower respiratory tract.
lymphoid cells
lymphocytes and plasma cells.
lymphoid foci
small foci of lymphoid tissue which occur in almost all parenchymatous organs in birds. The foci are not encapsulated and blend with the surrounding tissue.
lymphoid follicles
see lymph nodule.
lymphoid granuloma
one of the lesions in chronic follicular pharyngitis in the horse and a cause of persistent cough, difficulty in swallowing and a stertorous respiration.
gut-associated lymphoid tissue (GALT)
aggregations of mucosal-associated lymphoid tissue in the gastrointestinal tract, including adenoids, tonsils, Peyer's patches and lamina propria of the intestine; responsible for a local immune response to antigens.
lymphoid leukemia
see lymphatic leukemia.
lymphoid leukosis
a very rare primary tumor in mammals characterized by high blood lymphocyte counts. It is the most common form of the avian leukosis complex of diseases caused by avian retroviruses. Birds are affected between the ages of 14 to 30 weeks and show nonspecific signs of emaciation, inappetence and weakness, but many also have enlarged abdomens and a palpably enlarged liver. The primary lesion is the transformation of B lymphocytes in the lymphoid follicles of the bursa of Fabricius, but multiple metastatic lesions occur in the liver, spleen, etc.
mucosal-associated lymphoid tissue (MALT)
aggregations and organized lymphoid cells tissue found immediately beneath mucous membranes lining the respiratory, gastrointestinal and urogenital system.
lymphoid organs
primary lymphoid organs include the thymus and the bursa of Fabricius and its mammalian equivalent; secondary lymphoid organs include lymph nodes, spleen, Peyer's patches, etc.
skin-associated lymphoid tissues
include a group of non-activated T lymphocytes and Langerhans cells derived from lymphatic or hematopoietic tissues which have antigen-presenting properties; enable the skin to maintain a functional immunological relationship with the immune system. Called also SALT.
lymphoid system
the lymphoid tissue of the body, collectively; it consists of the bone marrow, thymus, lymph nodes, spleen, and gut-associated lymphoid tissue (tonsils, Peyer's patches).
lymphoid tissue
a lattice work of reticular tissue, the interspaces of which contain lymphocytes.
lymphoid tumor
References in periodicals archive ?
Thus, CD72 and Fas appear to maintain the tolerance of self-reactive B cells in peripheral lymphoid organs at different B cell differentiation stages and by distinct mechanisms, and their deficiency synergistically induce autoimmune disease.
In the present study bursal histological changes observed in group A were minimal, in group B mild changes observed in lymphoid organs whereas in group C and D no pathological changes observed.
The relative weight of lymphoid organs is often used to predict the immune status of an animal (Abdel-Fattah et al.
During primary responses, T cells differentiate into effector cells in lymphoid organs.
In poultry, the bursa of Fabricius, thymus and spleen are important lymphoid organs in antibody production.
DC then migrate to the peripheral lymphoid organs where they recruit and reciprocally activate other leukocytes including NK cells [5].
Meckel's diverticle: a gut associated lymphoid organ in chickens.
Intermediate and intermediate plus IBDV vaccination has been reported to induce histopathological lesions in primary lymphoid organs, compromising in some extent the humoral immune response [18].
Patients with acute lymphoblastic leukemia (ALL) present most frequently with signs and symptoms of the uncontrolled growth of leukemic cells in bone marrow, lymphoid organs and other sites of extramedullary spreading such as cerebrovascular disease, pleural effusions, blindness, etc.
In this DOCK2 knockout mouse, the function of activating Rac to mediate actin cyteskeleton, the lymphocyte migration function in response to stimuli with chemokines such as SLC, SDF-1, BLC, the homing function to secondary lymphoid organs such as spleen, lymph nodes and Peyer's patches, and the function of emigrating mature thymic T cells into peripheral blood in response to stimulus with chemokine ELC are impaired, and as a result of this, immune responses are suppressed.
Well-illustrated with line drawings and clinical photographs, the topics include the barriers of the innate immune system to infection, pattern recognition molecules, phagocytes, interferons and other danger signals, the T-cell receptor and the generation of diversity, macromolecular antigen, immunoglobulin structure and classes, B cells and memory B cells, the secondary lymphoid organs, Type 1 to Type 4 hypersensitivity, tuberculosis, autoimmunity, tumors, vaccines and HIV.