The cartilage in its sternum (breast bone in the centre of the chest) had not yet fully turned to bone. (bbc.com)
Chest Injuries: Broken ribs and a broken breast bone can also result from the severe impact of a car accident. (myvirginiainjurylawyer.com)
Working with 1 chicken half at a time, angle the blade of a thin, sharp knife flush against breast bone and cut along bone to separate the rib cage from flesh. (bonappetit.com)