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Finally, starting superiorly, remove the sternum and attached ribs, the anterior chest wall . When removing the anterior chest wall, again push the underlying structures away from the chest wall's internal surface. When the chest wall has been removed, the course of the internal thoracic artery and vein can be seen more clearly.The first six anterior intercostal arteries arise from the internal thoracic artery. These arteries also give branches to the breast. The anterior intercostal veins drain into the internal thoracic veins. Internal thoracic (parasternal) lymph nodes [cross-section] are located along the course of the internal thoracic vessels. They receive lymph from the breast and anterolateral chest wall.
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