Collar bone

In anatomy, the clavicle or collar bone is a bone located in the chest wall anterior and superior to the lungs.

It articulates with the sternum[?] medially and the acromion, part of the scapula, laterally. It is part of the shoulder girdle[?] and together with the scapula, allows for the free range of motion of the arms. Compare this with the limited range of motion of the legs.