Anatomical Analysis of the Human Upper Limb Skeleton Anatomy The upper limb is composed of three chained mechanisms, the shoulder girdle, the elbow and the wrist. Considering bones in pairs, seven joints may be distinguished: the sterno-clavicular joint, which articulates the clavicle by its proximal end onto the sternum, the acromio-clavicular joint, which articulates the scapula by its ...