Question

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the abdominal and thoracic walls are drained by tributaries of two major veins: the vein and the vein.

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Explanation:

In human anatomy, the abdominal and thoracic walls are drained by tributaries of the superior vena cava and inferior vena cava. These two major veins play crucial roles in returning de - oxygenated blood to the heart. The superior vena cava drains blood from the upper body regions including parts of the thoracic wall, while the inferior vena cava drains blood from the lower body including the abdominal wall.

Answer:

superior vena cava; inferior vena cava