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In the shoulder, branches of the brachial artery provide oxygenated blood to the muscles and bones. As muscles use the oxygen from the blood, it must be returned to the lungs to once again receive oxygen. This happens via veins. The major veins of the shoulder are:
The shoulder has several other important structures: The rotator cuff is a collection of muscles and tendons that surround the shoulder, giving it support and allowing a wide range of motion. The bursa is a small sac of fluid that cushions and protects the tendons of the rotator cuff.