Which veins unite to form the superior vena cava?

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Multiple Choice

Which veins unite to form the superior vena cava?

Explanation:
The superior vena cava is formed by the union of the right and left brachiocephalic veins. Each brachiocephalic vein is created by the junction of the internal jugular vein with its corresponding subclavian vein. The left brachiocephalic vein crosses the superior mediastinum to join the right brachiocephalic behind the right first costal cartilage, forming the SVC. The azygos system drains into the SVC but does not form it, and the inferior vena cava does not participate in forming the SVC.

The superior vena cava is formed by the union of the right and left brachiocephalic veins. Each brachiocephalic vein is created by the junction of the internal jugular vein with its corresponding subclavian vein. The left brachiocephalic vein crosses the superior mediastinum to join the right brachiocephalic behind the right first costal cartilage, forming the SVC. The azygos system drains into the SVC but does not form it, and the inferior vena cava does not participate in forming the SVC.

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