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The thymus is an organ composed of two lobes and is located directly in front of the heart and behind the sternum. It is a critical part of the immune system because it trains and modifies T cells that are used by the body to fight foreign materials that can cause sickness.
One important part of the immune system is the thymus, which is a pyramid-shaped organ of the immune system that is involved in producing T cells, or lymphocytes. Location of the Thymus. The thymus is located in the chest in an area in front of the heart and directly behind the sternum. If you use your finger to feel the top of your sternum in the center of your chest, the thymus will be positioned about two centimeters behind the location of your finger.