the region of the thoracic cavity where the heart is located
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 two pleural cavities are situated on both sides of the body, anterior to the spine and lateral to the breastbone. 2  The superior mediastinum is a wedge-shaped cavity located between the superior regions of the two thoracic cavities.