Answer
The mediastinum is a compartment of the thoracic cavity that extends from the sternum to the spine, and from the first rib to the diaphragm; it occupies the space between the lungs.
Work Step by Step
The medastinum is a space in the thorax that contains all the thoracic viscera except the lungs. It is divided into superior and inferior mediatinum. The inferior mediatinum is further sub-divided into middle mediatinum, anterior mediastinum, and posterir mediastinum. The posterior mediastinum contains the esophagus, the aortic aorta, the thoracic duct and the azygos veins.
