The rib cage encloses protect heart and lungs. It provides a strong framework onto which the muscles of the shoulder girdle, chest, upper abdomen and back can attach.
12 thoracic vertebrae in the back form the bony cage for protection of heart , lungs vital organs.
The sternum or breastbone is a long flat bone located in the center of the chest. It connects to the ribs via cartilage, forming the front of the rib cage, and thus helps to protect the heart, lungs, and major blood vessels from injury.