Which of these structures connects the ribs to the breastbone?

The structure that connects the ribs to the breastbone is the sternum. The sternum, also known as the breastbone, is a flat bone located at the front center of the chest. It serves as a central point of attachment for the ribs through costal cartilage, which allows the ribs to connect to the sternum, forming the front portion of the rib cage. This connection is vital for protecting the heart and lungs as well as providing structure to the thoracic cavity. The ribs articulate with the vertebrae at the back, but it is the sternum that connects the ribs at the front, highlighting its key role in the skeletal system.