What bones are involved in the formation of the joint between the shoulder girdle and the free limb?

What bones are involved in the formation of the joint between the shoulder girdle and the free limb? What makes this joint different from most other joints in the skeleton?

In the formation of the shoulder joint, that is, the joint between the shoulder girdle and the free limb, the scapula and the humerus are involved, while the head of the humerus enters the glenoid fossa of the scapula.
This joint is different in that it is multiaxial and provides a wide range of movements: inward and outward rotation, flexion, abduction, extension.



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