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No set of testicles is exactly the same size as another. On average, a single testicle is an average length of about 4.5 to 5.1 centimeters (about 1.8 to 2 inches). Testicular anatomy. (n.d.).

The spermatic cord provides blood flow to the testicle. Testicular torsion is when a testicle rotates on this cord. It can lead to pain, swelling, and other symptoms and needs urgent medical attention ...