What are the organs and tissues of the immune system?
The primary organs of the immune system are the bone marrow (located within the bone) and the thymus (located in the chest above the heart). These organs are significant because they are the site of the production and maturation of the most important cells of the immune response: the Lymphocytes. The thymus is composed primarily of Iymphocytes and epithelial cells and is connected to the Lymphatic system. The Iymphatics along with the spleen make up what is referred to as the secondary Iymphoid tissue.The Iymphatic system is a network of vessels throughout the body which circulate Iymph fluid. This fluid contains cells and proteins (Iymphocytes and antibodies) of the immune system which bathes tissues and organs in a protective medium. These vessels form nodes in the neck, axilla and the groin. Lymph nodes filter lymph fluid and trap microorganisms. These trapped invaders stimulate lymphocytes to mount a defense against them, the outward sign of which is seen as swollen Iymph nodes (sw
