Although the clavicle is at the top of the torso, the clavicle is not a trunk bone. The adult trunk bones include the vertebrae, sacrum, coccyx, ribs, and sternum. The bone structures that are part of the trunk bones are flat and irregular. The bones of the trunk are centered in the thorax, lumbar, and back regions and are closer to the body’s median axis. The limb bones are located farther away from the body’s center axis and are involved in limb movement. These bone structures are limb bones, which is what distinguishes most of the trunk bones from most of the limb bones. Most of the limb bones are long bones, including the clavicle, humerus, radius, ulna, femur, tibia, and fibula. The pelvic bone and scapula, belong to the limb bones in the morphology of the structure of a more special part, although all belong to the limb bones, but their shape and the sternum, ribs are the same as the flat bone, but because of its main participation in the movement of the limbs, so it is the limb bones rather than the trunk bone. The clavicle moves when the arms are lifted bilaterally to increase the range of motion of the arms.