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The clavicle (collar bone) is the only bone connecting the pectoral girdle to the axial skeleton and is the only long bone that lies horizontally in human skeleton. The clavicle articulates with acromion at the acromioclavicular joint laterally and the sternum at the sternoclavicular joint medially.   It is the first bone to start ossification at around 5th-6th weeks of gestation but finishes around 21-25 years of age. The model shows parts of the related joints, bones and ribs.