Learn about the mediastinum , a visceral compartment of the thoracic cavity that contains the heart, esophagus, trachea, and other vital structures. Explore its division into superior and inferior mediastinum , and its clinical relations and lymphatics. mediastinum , the anatomic region located between the lungs that contains all the principal tissues and organs of the chest except the lungs. It extends from the sternum, or breastbone, back to the vertebral column and is bounded laterally by the pericardium, the membrane enclosing the heart, and the mediastinal pleurae, membranes that are continuous with those lining the thoracic cage. The mediastinum is a division of the thoracic cavity; it contains the heart, thymus gland, portions of the ... The thoracic mediastinum is the compartment that runs the length of the thoracic cavity between the pleural sacs of the lungs. This compartment extends longitudinally from the thoracic inlet to the superior surface of the diaphragm. Although there are no physical barriers between compartments other than the pericardium, the mediastinum is typically discussed based on subdivisions. The four-compartment model divides the mediastinum into the superior, anterior, middle, and posterior portions ...
