Lymph node, any of the small, bean-shaped masses of lymphoid tissue enclosed by a capsule of connective tissue that occur in association with the lymphatic vessels. As part of the lymphatic system, lymph nodes serve as filters for the blood, providing specialized tissues where foreign antigens can A small bean-shaped structure that is part of the body’s immune system. Lymph nodes filter substances that travel through the lymphatic fluid, and they contain lymphocytes (white blood cells) that help the body fight infection and disease. A lymph node is a small, bean-shaped structure that is part of the lymphatic system. It acts as a filter for lymph, a fluid containing white blood cells that circulates throughout the body. Lymph nodes are composed of a network of lymphoid tissue and contain immune cells, such as lymphocytes and macrophages. Learn about subcentimeter lymph nodes, including their causes, symptoms, and treatment options. Find out how Statcare can help you with comprehensive healthcare solutions.