Which structure is NOT typically contained within the mediastinum?

Which structure is NOT typically contained within the mediastinum?

• A. Heart
• B. Esophagus
• C. Trachea
• D. Lungs

Answer: (D)

The mediastinum is the central thoracic compartment that houses the heart and its coverings, the great vessels, and the central airways and esophagus. The heart sits encased in the pericardial sac in the middle; the major vessels (aorta, vena cavae) run through or from this area; the trachea and main bronchi, as well as the esophagus, pass through or behind the central space; other structures like thymus tissue, nerves, and lymphatics are also there. The lungs, by contrast, lie in their own pleural sacs on either side of the mediastinum and are not contained within this central compartment. This separation is why the lungs are the structure that is not typically contained within the mediastinum.

The mediastinum is the central thoracic compartment that houses the heart and its coverings, the great vessels, and the central airways and esophagus. The heart sits encased in the pericardial sac in the middle; the major vessels (aorta, vena cavae) run through or from this area; the trachea and main bronchi, as well as the esophagus, pass through or behind the central space; other structures like thymus tissue, nerves, and lymphatics are also there. The lungs, by contrast, lie in their own pleural sacs on either side of the mediastinum and are not contained within this central compartment. This separation is why the lungs are the structure that is not typically contained within the mediastinum.