Thoracic skeleton:

• A. the function of the ribs is primarily to protect the thoracic contents
• B. each rib articulates with its own thoracic vertebra and the one above
• C. the tubercle of a typical rib has two facets, the lateral facet being non-articular
• D. the 2nd to 7th sternocostal joints are synovial type, each with a single cavity
• E. the body of the sternum usually fuses with the manubrium with advancing age