what is thymus gland
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 is a two lobed structure that is positioned in the upper chest cavity. It partially extends into the neck region. The thymus is situated above the pericardium of the heart, in front of the aorta, between the lungs, below the thyroid, and behind the breastbone.