» This article uses some professional terms to describe relative positions and directions. See Anatomical terms of location for more detailed information. In human anatomy, the clavicle or collar bone's classified as a flat bone that makes up part of the shoulder girdle (pectoral girdle). It receives its name from the Latin clavicula ("little key") because the bone rotates along its axis like a key when the shoulder's abducted. This movement's palpable. In some people, particularly females who… (More on Clavicle)