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The pectoral girdle attach the upper limbs to the axial skeleton and also provides attachment points for several muscles that move the upper limbs. The girdles are very light, therefore, allows upper limbs a greater degree of movement, however, because only the clavicle attaches to the axial skeleton, the scapula move freely across the thorax, allowing the arm to move with it. This arrangement is good for flexibility, but does not provide stability: which causes shoulder dislocation in many instance.....Anatomy & Physiology (pg.198) ..EB

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