The ribs encase and protect the chest cavity, where many vital organs, including the heart and the lungs, are located. Ensuring this protection, the rib cage is collectively made up of long, curved individual bones with joints to the spinal vertebrae. At the chest, many rib bones connect to the sternum via costal cartilage. Although fixed into place, there ribs do allow for some movement, and this helps stabilize chest during inhalation and exhalation. The human rib cage is made up of 24 bones; each are symmetrically paired on a right and left side. Of all 24 ribs, the first seven pairs are often labeled as "true." These bones are connected to the costal cartilage, while the five other "false" sets do not. Three of those connect to non-costal cartilage, and two are deemed to be "floating," which means they only connect to the spine. While there have been some cases of minor anatomical variation, men and women generally have the same amount of ribs. A differing rib count between the genders is largely a medical myth.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Ribs