The thymus gland is in the chest, between the lungs and behind the breastbone sternum. It is just in front of, and above, the heart. The thymus makes white blood cells called T lymphocytes also called T cells. These are an important part of the body's immune system, which helps us to fight infection.
The thymus produces all our T cells before we become teenagers. It gradually becomes less active and eventually gets smaller and is replaced by fat tissue.
Also shown are the ribs, lungs, and heart. Anatomy of the thymus gland. The thymus gland is a small organ that lies in the upper chest under the breastbone. It makes white blood cells, called lymphocytes, which protect the body against infections.
Any use of this image is subject to prevailing copyright laws. T-cells have derived their name from the thymus, because this is where they are produced in the human body. Lymphoid stem cells are delivered to the outer cortex, or layer, of the thymus in blood. After multiplying within the outer cortex, they then move to the inner cortex where they develop T-cell surface markers. The maturation of T-cells is guided by thymopoietin, thymosin, and other hormones created in the thymus.
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