The clavicle is the topmost limb bone structure of the human body, and the horizontal position of the clavicle corresponds to the front and back side of the body. The horizontal position of the clavicle near the midline end of the body is relatively low, while the more it moves to the outside of the body, the higher the horizontal position. The horizontal position of the sternoclavicular joint corresponds to the upper edge of the first rib, while the horizontal position of the sternoclavicular joint corresponds to the back side of the body, the horizontal position of the overall midpoint of the clavicle corresponds to the back side of the body, and the horizontal position of the outermost end of the clavicle and the shoulder joint corresponds to the back side of the body. The level of the outermost end of the clavicle at the point of attachment to the shoulder joint corresponds to the posterior rib of the first rib. The clavicle is similar to the shape of the letter S. It is an important limb bone that connects the torso and the arm, and the clavicle can significantly increase the range of motion of the human arm.