Definition:
Substernal is deep within the sternum or breastbone. The sternum is located directly in the center of the chest. It connects with the ribs to form the rib cage, which protects your heart and lungs from damage.
Substernal
By Sheryl Ankrom, About.com
Updated: February 18, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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