Lymfoïde

Lymfoïde refers to tissues and cells of the lymphatic system. This system is a crucial part of the immune system and plays a vital role in fluid balance and fat absorption. Lymfoïde tissues are broadly categorized into primary and secondary lymphoid organs. Primary lymphoid organs, such as the bone marrow and thymus, are where lymphocytes, the key cells of the immune system, are produced and mature. Bone marrow is responsible for generating all lymphocytes, while the thymus is where T lymphocytes mature.

Secondary lymphoid organs, including the lymph nodes, spleen, and mucosa-associated lymphoid tissue (MALT), are sites where mature lymphocytes encounter antigens and initiate an immune response. Lymph nodes filter lymph fluid, trapping foreign substances and facilitating lymphocyte interaction. The spleen filters blood, removing old red blood cells and housing lymphocytes and macrophages. MALT, found in mucous membranes throughout the body, offers localized immune surveillance. The term lymfoïde can also describe cells that originate from or are related to this system, such as lymphoid cells or lymphoid neoplasms. These neoplasms, often referred to as lymphomas or leukemias, involve the abnormal proliferation of lymphocytes.