The testicles are part of the male reproductive system.45

  • The testicles are two oval organs that are located inside the scrotum, the loose sac of skin that hangs behind the penis.
  • The testicles make the male hormones, including testosterone, and produce sperm, the male reproductive cells.
  • Disorders of the testicles or trauma to the testicles can lead to serious complications, including hormonal imbalances, sexual dysfunction and infertility.