( A ) Scapula is commonly called the collar bone.
( B ) Below the acromion (in scapula) is a depression called the glenoid cavity which articulates with the head of the humerus to form the shoulder joint.
( C ) Each clavicle is a long slender bone with two curvatures.
( D ) Scapula is a large triangular flat bone situated in the dorsal part of the thorax between the second and the seventh ribs.