Article / Updated 03-26-2016
Whereas the axial skeleton lies along the body’s central axis, the appendicular skeleton’s 126 bones include those in all four appendages — arms and legs — plus the two primary girdles to which the appendages attach: the pectoral (chest) girdle and the pelvic (hip) girdle.
The pectoral girdle is made up of a pair of clavicles, or collarbones, which attach to the sternum medially and to the scapula laterally articulating with the acromion process, a bony prominence at the top of each of the pair of scapulae, better known as shoulder blades.