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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.
These cells are termed T-cells (T for thymus gland). The T-4 Helper cell is the manager of the immune system. It is one kind of white blood cell that needs a thymic protein to be activated.hymus Gland. The thymus is a small gland located behind the upper chest area, which plays a key role in proper immune functioning. This gland peaks in size at puberty, and then begins steady involution (shrinkage), until eventually it becomes incapable of producing certain proteins the immune system needs.