Lymph node

Lymph nodes are components of the lymphatic system.

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Clusters of lymph nodes are found in the underarms, groin, neck, chest, and abdomen. Lymph nodes act as filters, with an internal honeycomb of connective tissue filled with lymphocytes that collect and destroy bacteria and viruses. When the body is fighting an infection, these lymphocytes multiply rapidly and produce a characteristic swelling of the lymph nodes.

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The spleen and tonsils are large lymphoid organs that serve similar functions, though the spleen does not filter lymph but blood.

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Spleen: The spleen is a ductless, vertebrate gland that is not necessary for life but is closely associated with the circulatory system, where it functions in the destruction of old red blood cells and removal of other debris from the bloodstream, and also in holding a reservoir of blood. It is regarded a...

Tonsil: The tonsils are areas of lymphoid tissue on either side of the throat. An infection of the tonsils is called tonsillitis....