Final answer:
The right lymphatic duct empties into the right subclavian vein, and the thoracic duct empties into the left subclavian vein. The superior vena cava, though not directly connected to the ducts, is the major vein that drains blood from the subclavian and jugular veins.
Step-by-step explanation:
The highlighted duct in the question is part of the lymphatic system, which plays a crucial role in fluid balance and the immune response of the body. There are two main ducts in the lymphatic system: the right lymphatic duct and the thoracic duct. The right lymphatic duct drains lymph fluid from the upper right side of the body and empties into the right subclavian vein. On the other hand, the thoracic duct drains lymph from the rest of the body into the left subclavian vein. The superior vena cava is the major vein that receives blood from the subclavian veins, as well as from the internal and external jugular veins, but it is not the direct recipient of lymph from the ducts mentioned.