What are the functions of the eleventh and the twelfth ribs?

The eleventh and twelfth ribs, known as floating ribs, have several functions. They provide structural support to the rib cage while allowing for flexibility and movement of the torso. Unlike other ribs, they do not attach to the sternum or the vertebrae in a conventional manner, which contributes to the mobility of the lower rib cage and the diaphragm during respiration. Additionally, they serve as attachment points for muscles, aiding in the movement and stability of the lumbar region.