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The thoracic cavity is the more superior subdivision of the anterior cavity, and it is enclosed by the rib cage. The thoracic cavity contains the lungs and the heart, which is located in the mediastinum.The diaphragm forms the floor of the thoracic cavity and separates it from the more inferior abdominopelvic cavity. The superior mediastinum is a wedge-shaped cavity located between the superior regions of the two thoracic cavities. 2  The pericardial cavity within the mediastinum is located at the center of the chest below the superior mediastinum.
Answer Wiki. The heart, actually, is located in the center of the chest, behind the sternum (or the breastbone). However, a part of it is slightly offset to the left, as you can figure out from the picture above. For understanding this, I think prerequisite knowledge of the heart's basic anatomy is required.