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Lymph System

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16 December 2015

Lymphatic And Immune System The Lymphatic System Anatomy The lymphatic system is closely related to the cardiovascular system. It is composed of lymphatic vessels, lymphoid tissues and organs, and lymph. The lymphatic vessels are composed of capillaries, collecting vessels, and trunks (Klein, 2010). Lymphatic capillaries drain into the collecting ducts that drain into the trunks. The trunks drain into the subclavian veins. Lymphatic organs in the body include lymph nodes, thymus gland, the spleen, tonsils, lymphatic vessels, and Peyer' patches in the small intestines. In comparison to blood vessels, lymphatic vessels have all the three tunics found on blood vessels. However, large vessels have a vasa vasorum layer in addition to the three tunics found in other vessels. Like blood vessels, lymphatic vessels have many valves (that prevent back flow) and anastomoses. They are characteristically larger than blood vessels and on their walls are overlapping flaps that allow large proteins to get into circulation. Lymph nodes, are present along the lymphatic vessels and range in size from the size of a pin head to that of a lima bean. Examples of lymph nodes include the popliteal lymph nodes, the inguinal lymph node, the cubital, axillary, and cervical lymph nodes as shown in figure one below. Lymph nodes or glands mostly occur in clusters and drain various parts of the body depending on their location. For example, the axillary lymph nodes are located under the armpit and they drain the upper thorax and arm. The cervical lymph nodes drain the neck, teeth, nose and lips. The inguinal lymph nodes are found in the groin area and drain the legs and genitals as shown in figure one below. Figure 1: shows the human lymphatic system and the...

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