THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Anterior mediastinum: The part anterior to (in front of) your heart, between your heart and your sternum (breastbone). Middle mediastinum: The part that contains your heart. Posterior mediastinum: The part posterior to (behind) your heart.

Detailed explanation-2: -The main mediastinal contents are the heart, esophagus, trachea, thoracic nerves and systemic blood vessels.

Detailed explanation-3: -The middle mediastinum contains the pericardium and heart inferiorly and the great vessels entering and leaving the heart superiorly. The vagus and phrenic nerves lie in an intermediate position. The trachea dividing into the right and left bronchi lies more posteriorly.