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From Wikipedia, the free encyclopedia. Lymph is the fluid that circulates throughout the lymphatic system. The lymph is formed when the interstitial fluid (the fluid which lies in the interstices of all body tissues) is collected through lymph capillaries.It is then transported through lymph vessels to lymph nodes before emptying ultimately into the right or the left subclavian vein, where it mixes back with blood.ince the lymph is derived from the interstitial fluid, its composition continually changes as the blood and the surrounding cells continually exchange substances with the interstitial fluid. Lymph returns proteins and excess interstitial fluid to the bloodstream.
Lymph nodes are small round organs that are part of the bodyâs lymphatic system. They are found widely throughout the body and are connected to one another by lymph vessels. Groups of lymph nodes are located in the neck, underarms, chest, abdomen, and groin. A clear fluid called lymph flows through lymph vessels and lymph nodes. Anatomy of the lymphatic system, showing the lymph vessels and lymph organs, including lymph nodes, tonsils, thymus, spleen, and bone marrow. One inset shows the structure of a lymph node and the lymph vessels, with arrows showing how lymph and immune cells called lymphocytes move into and out of the lymph node.