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Thymus. The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland is to promote the development of specific cells of the immune system called T lymphocytes.he thymus gland acts to regulate the immune system through the development of immune cells responsible for cell mediated immunity. In addition to immune function, the thymus also produces hormones that promote growth and maturation.
It is a flattish structure divided into two lobes, and it plays a part in the normal functioning of the immune system. An enlarged thymus gland can occur for a number of reasons, including simple overgrowth of thymus tissue, which is found in some autoimmune disorders where the body's immune system attacks itself.