This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells).
There are two primary lymphatic organs: the red bone marrow and the thymus gland. The development of white blood cells (haemopoesis) was covered briefly in the section on blood.
Spleen: This largest lymphatic organ is located on your left side under your ribs and above your stomach. The spleen filters and stores blood and produces white blood cells that fight infection or disease. Thymus: This organ is located in the upper chest beneath the breast bone.
The primary lymphoid organs are the red bone marrow, in which blood and immune cells are produced, and the thymus, where T-lymphocytes mature. The lymph nodes and spleen are the major secondary lymphoid organs; they filter out pathogens and maintain the population of mature lymphocytes.
The liver primarily operates as a metabolic center to maintain homeostasis that includes processing of gut-derived nutrients, the clearance of toxins, and the production of the bile (1). Besides these well-known functions, it is also considered as a lymphoid organ (2).
Spleen is a 2° lymphoid organ and it is the largest organ among all 5 lymphoid organs.
Liver is not a lymphoid organ.
There are hundreds of lymph nodes throughout your body. The most well-known places where you'll find lymph nodes are in your armpits, neck and groin.
liver, the largest gland in the body, a spongy mass of wedge-shaped lobes that has many metabolic and secretory functions.
Answer and Explanation: The kidney and livers are both included in the lymphatic system for different reasons. The liver is included in the lymphatic system because the liver is responsible for producing a large amount of lymph, for the lymphatic system.
The lymphatic vessels drain into collecting ducts, which empty their contents into the two subclavian veins, located under the collarbones. These veins join to form the superior vena cava, the large vein that drains blood from the upper body into the heart.
The skin, i.e. the epidermis and its lymphocytes and perhaps part of the lymphocytes in corium, may function as a first level lymphoid organ. This organ may be completely diffuse, but it may also be concentrated in certain lymphoepithelial micro-organs.
Answer and Explanation: The thyroid gland and pancreas are not considered lymphoid tissue or lymphoid organs.
During normal human fetal pancreatic development lymphoid tissue arises in and around the pancreas. DCs are antigen-presenting cells which are capable of initiating immunity, but are also essential in inducing and maintaining T-cell tolerance.
There are two main types of lymphocytes: B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body's own cells that have themselves been taken over by viruses or become cancerous.
As mentioned earlier, it is in the peripheral lymphoid organs that T cells and B cells react with foreign antigens (see Figure 24-6). T and B cells become morphologically distinguishable from each other only after they have been activated by antigen.
The bone marrow and thymus are primary lymphoid tissues and the sites of lymphocyte development. The lymph nodes, spleen, tonsils and Peyer's patches are examples of secondary lymphoid tissue.
There are two lymph ducts in the body: the right lymph duct and the thoracic duct. There are four pairs of lymph trunks: jugular lymph trunks, subclavian lymph trunks, bronchomediastinal lymph trunks, and lumbar lymph trunks. In addition, the intestinal lymph trunk is unpaired.
There are two types of lymphatic drainage which may be used to treat lymphoedema – manual lymphatic drainage (MLD) and simple lymphatic drainage (SLD). Lymphatic draining techniques provide regular stimulation of the lymph vessels under the skin.