The lymphatic system has two main functions. Neck (there is a chain of lymph nodes on either side of the front of the neck, both sides of the neck, and down each side of the back of the neck).Eventually, these organisms are destroyed and eliminated by cells that line the walls of the lymph nodes and the swelling and pain subside.Ĭommon areas where the lymph nodes can be felt (with the fingers) include: When the body is invaded by foreign organisms, the painful swelling sometimes felt in the neck, armpits, groin, or tonsils comes from the microorganisms being trapped inside collections of lymph cells or nodes. Overall, lymph nodes work like a biological filtering system. Afferent lymph vessels bring unfiltered fluids into the lymph node to be filtered while efferent vessels carry clean fluids away from the lymph node and to the cardiovascular system where it helps form the plasma in the blood. The most common cause of swollen lymph nodes is infection, which might occur even if the infection is trivial or not. Lymph nodes play an important part in the body's defense against infection. It helps to protect and maintain the fluid environment of the body by producing, filtering, and conveying lymph and by producing various blood cells. The lymphatic system is a complex network of thin vessels, valves, ducts, nodes, and organs.
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