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Ribs 1-7 are considered ( false ribs, vertebrochondral ribs, true ribs, floating ribs ), or vertebrosternal ribs, because they attach directly to the sternum by their own costal cartilage. Ribs 8-12, on the other hand, are classified as ( floating ribs, vertebrochondral ribs, true ribs, false ribs ) because they lack this direct attachment to the sternum. Ribs 8-10 are ( vertebrochondral ribs, vertebrosternal ribs, floating ribs, true ribs ) as they have an indirect attacment to the sternum, as their cartilage attaches to the costal cartilage of the true ribs. Ribs 11-12 have no attachment to the sternum at all, so they are often referred to as ( false ribs, floating ribs, vertebrochondral ribs, vertebrosternal ribs ) or vertebral ribs.