Lymph node
A lymph node or lymph gland is an ovoid kidney-shaped organ of the lymphatic system, In the lymphatic system the lymph node is a secondary lymphoid organ that is widely present throughout the body. A lymph node is enclosed in a fibrous capsule and is made up of an outer cortex and an inner medulla. Lymph nodes are major sites of B and T lymphocytes, and other white blood cells. Lymph nodes are important for the proper functioning of the immune system, acting as filters for foreign particles and cancer cells. They are linked by the lymphatic vessels as a part of the circulatory system. Lymph nodes do not have a detoxification function.
Lymph nodes also have clinical significance. They become inflamed or enlarged in various diseases which may range from trivial throat infections, to life-threatening cancers. The condition of the lymph nodes is very important in cancer staging, which decides the treatment to be used, and determines the prognosis. When swollen, inflamed or enlarged, lymph nodes can be hard, firm or tender.
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