The subclavian veins

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The subclavian veins deliver blood to the brachiocephalic veins, which in turn merge to form the superior vena cava that carries blood to the heart. The inferior vena cava receives blood from the lower body and empties it into the right atrium of the heart. The subclavian and jugular veins form the brachiocephalic veins, and together they drain blood from the head, neck, and upper limbs. The hepatic portal circulation involves the hepatic portal vein that carries nutrient-rich blood from the digestive system to the liver for processing before it enters the systemic circulation.

The Subclavian Veins