This network of veins coalesces into the gonadal, or testicular, vein. The right gonadal vein drains into the inferior vena cava, while the left gonadal vein drains into the left renal vein at right angle to the renal vein, which then drains into the inferior vena cava. varicocele /ˈvaerɨkɵsiːl/ ˈværɨkɵsiːl is an abnormal enlargement of the pampiniform venous plexus in the. Scrotum this plexus of veins drains the. Testicles the testicular blood vessels originate in the abdomen and course down through the inguinal canal as part of the spermatic cord on their way to the. testis