How many pairs of ribs are considered "true" ribs?

True ribs are defined as the first seven pairs of ribs that directly connect to the sternum via costal cartilage. This direct attachment is what distinguishes them as "true" ribs. The remaining pairs, known as "false" ribs, either connect indirectly to the sternum or do not connect to it at all. The first seven pairs (ribs 1 through 7) provide a crucial protective function for vital organs in the thoracic cavity and also play a vital role in the mechanics of breathing. Understanding this classification helps in recognizing the anatomical differences and functions of rib pairs in the human body.