It is a complex system made up of lymph organs, such as bone marrow, tonsils, the thymus and the spleen, and lymph nodes which are connected by a network of tiny lymphatic vessels. Lymph nodes are found mainly in the neck, armpit and groin. Their number varies from one part of the body to another, in some parts there are very few whereas under your arm there may be between 20 and 50 nodes. Circulating through the lymphatic vessels is milky looking fluid called lymph, which contains lymphocytes. Lymphocytes are white blood cells which are an essential part of the body's defence against infection and disease.
All lymphocytes originate in the bone marrow as immature cells called stem cells.
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