Middle Mediastinum- Anatomy, Boundaries And Content

Boundaries

• Anterior: Anterior mediastinum.
• Posterior: Posterior mediastinum.
• Superior: Superior mediastinum.
• Inferior: Diaphragm.

Contents

1) Heart.

2) Pericardium.

3) Arteries:

• Ascending aorta.
• Pulmonary trunk dividing into 2 pulmonary arteries.
• Pericardiophrenic arteries.

4) Veins:

• Superior vena cava (lower half).
• Azygos vein (terminal part).
• Pulmonary veins (left and right).

5) Nerves:

• Phrenic nerves.
• Deep cardiac plexus.

6) Lymph nodes: Tracheobronchial lymph nodes.

7) Tubes:

• Bifurcation of trachea.
• Left and right principal bronchi.

The main contents of middle mediastinum are pericardium and its contents (example, the heart and roots of its great vessels).