What are true ribs in humans?

True ribs in humans refer specifically to the first seven pairs of ribs, which are directly attached to the sternum via costal cartilage. This direct connection provides structural support and helps protect vital organs within the thoracic cavity, such as the heart and lungs.

The design of true ribs plays a crucial role in the respiratory system as they allow for expansion and contraction during breathing. In contrast to true ribs, some other types of ribs either do not attach directly to the sternum or are considered floating ribs, which are not attached to the sternum at all. This distinction highlights the unique function and anatomical structure of true ribs in the human skeletal system.