Which vessel does the left testicular vein drain into?

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Multiple Choice

Which vessel does the left testicular vein drain into?

The left testicular vein drains into the left renal vein. On the left side, the gonadal vein travels to the renal vein first and then that renal vein feeds into the inferior vena cava. This makes the left renal vein the immediate drainage vessel for the left testicular vein (whereas the right testicular vein drains directly into the IVC). This anatomy helps explain why left-sided varicoceles are more common: the left gonadal vein empties into the renal vein, and any increased pressure or compression at the renal vein–gonadal junction (and the tributary pathways) can raise venous pressure in the left testicular vein. The portal and splenic veins are part of the hepatic portal system and do not drain the testicles, and the IVC is the final common venous channel but not the direct, immediate drainage for the left gonad.

The left testicular vein drains into the left renal vein. On the left side, the gonadal vein travels to the renal vein first and then that renal vein feeds into the inferior vena cava. This makes the left renal vein the immediate drainage vessel for the left testicular vein (whereas the right testicular vein drains directly into the IVC).

This anatomy helps explain why left-sided varicoceles are more common: the left gonadal vein empties into the renal vein, and any increased pressure or compression at the renal vein–gonadal junction (and the tributary pathways) can raise venous pressure in the left testicular vein. The portal and splenic veins are part of the hepatic portal system and do not drain the testicles, and the IVC is the final common venous channel but not the direct, immediate drainage for the left gonad.

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