Ribs are flat bones. This is confirmed by multiple sources. Human ribs are specifically described as flat bones that form the rib cage, protecting vital internal organs. Human ribs are flat bones that form part of the rib cage to help protect internal organs. The reference materials consistently classify ribs within this bone category, highlighting their thin, yet often curved structure. Flat bones are thin, but are often curved, such as the ribs. While ribs have a specific function within the skeletal system and are categorized into true, false, and floating ribs based on their connection to the sternum, their fundamental bone type remains that of a flat bone. Their flat structure is crucial to their role in protecting the thoracic cavity and its contents. The information provided also shows ribs are frequently mentioned in the context of bone cancer locations, further reinforcing their classification as flat bones. Ewing sarcoma - often starts in the pelvis, thigh bones, shoulder bones or the ribs. Although less often, other areas (such as the ribs) may be affected. These tumors can form in the bones and in surrounding soft tissues. Ewing sarcoma most commonly grows in the hips, ribs and shoulder blades, or on long bones
