Which type of ribs attach directly to the sternum?

True ribs are the specific type of ribs that attach directly to the sternum through costal cartilages. In humans and many other mammals, there are seven pairs of true ribs that connect anteriorly to the sternum, providing structural support and protection for vital organs in the thoracic cavity, such as the heart and lungs. This direct attachment is crucial as it contributes to the rigidity and stability of the ribcage, allowing for efficient respiratory movements. Understanding the distinction between true ribs and other categories, such as floating or false ribs, is important in anatomy, as it helps clarify how the ribcage functions as a protective structure while also supporting respiratory mechanics.