What is the mediastinum?

• A. Space between the lungs.
• B. Region within the lungs themselves.
• C. Space within the stomach.
• D. Space in the abdominal cavity.

Answer: (A)

The mediastinum is the central compartment of the thoracic cavity, located between the two lungs. It lies from the superior thoracic aperture down to the diaphragm and is bordered by the sternum anteriorly, the vertebral column posteriorly, and the lungs on the sides. This space houses the heart and great vessels, as well as the trachea, esophagus, and other important structures.

That’s why the correct description is the space between the lungs. It is not inside the lungs themselves, nor is it a space within the stomach or the abdominal cavity.