De Quervain tenosynovitis influences the two tendons to the thumb side of the wrist. Tendons are ropelike constructions that attach muscle mass to bone. The testicles receive oxygen-abundant blood from two testicular arteries — a single artery for each side with the scrotum. Similarly, there are also two testicular veins https://www.sgvascularctr.com/what-are-spider-veins/