What is the difference between thorax and thoracic cavity?

The thorax contains the heart, lungs and other important structures within a skeletal framework that also protects some of the abdominal organs. Thoracic cavity is the hollow space in the body. It is enclosed by the ribs, the vertebral column and the breastbone. Thoracic cavity includes the lungs, the heart, the great arteries and the major veins. 

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