"why the last bone of the ribcage is not connected to the sternum??
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This hard cartilage extends from the end of each rib and connects to the sternum. However, the bottom three ribs do not connect to the costal cartilage. They remain free, and are referred to as 'floating ribs'. It protects the heart and also serves as the connection point for the costal cartilage.
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they attached to the vertebrae. they are called floating ribs
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