What body structure protect the lungs from outside harm?

The thoracic cage protects the lungs from outside harm. It is a bony structure made up of the sternum, ribs, and vertebrae. The ribs are curved bones that connect the vertebrae to the sternum. The sternum is a flat bone that forms the front of the chest. The vertebrae are the bones that make up the spine. The thoracic cage surrounds and protects the heart, lungs, and other organs in the chest.