The major bones in the body. . The rib cage, spine, and sternum protect the lungs, heart and major blood vessels. . The tibia is the second largest bone in the body. Number of Muscles - The exact number of bones in the body is known. The following are exmples of major bones and muscles in the body,. It's time to look at all your bones — the adult human body has . . A clear and detailed diagram of the major bones of the body. . Adults have 206 bones. . . . The ten major bones in the human ... more