What is the name of the region that houses the heart and great vessels within the thoracic cavity?

• A. Mediastinum
• B. Pleural cavity
• C. Pericardial space
• D. Diaphragm

Answer: (A)

Think of the thoracic cavity as having a central compartment called the mediastinum. This space runs between the two pleural sacs and houses the heart and the great vessels, along with other structures like the trachea and esophagus. The heart sits inside the pericardial sac within this central region, and the major vessels connect with it there, which is why this area is described as the region that contains the heart and its main vessels. The other options refer to structures not defining this central housing: the pleural cavities surround the lungs, the pericardial space is the sac around the heart inside the mediastinum, and the diaphragm is the muscle that separates the thorax from the abdomen. So, the region is the mediastinum.