The mediastinum is the part of the chest that lies between the sternum and the spinal column, and between the lungs. This area contains the heart, large blood vessels, windpipe (trachea), thymus gland, esophagus, and connective tissues.
The mediastinum is also known as Breast bone.it is located midline of the body in the thorax region. the space b/w the left and right is referred to as the mediastinum