The floating rib refers to the last two pairs of ribs in the human rib cage, specifically the 11th and 12th ribs. Unlike other ribs, they are not directly attached to the sternum or to other ribs, making them "floating." These ribs provide some protection to the kidneys and other internal organs while allowing for flexibility in the torso. Floating ribs are classified as false ribs, which means they do not connect to the sternum via cartilage. They are shorter and more mobile than true ribs, which are directly attached to the sternum. Understanding the anatomy of the rib cage is important for studying human physiology and injuries related to the thoracic region.