Medically reviewed by Geetika Gupta, MDMedically reviewed by Geetika Gupta, MD The testes, or testicles, are two egg-shaped sex organs that play an important role in the male reproductive system.

People with male reproductive anatomy usually have two testicles (testes), commonly called balls. The function of testicles is to produce sperm and testosterone, which is a male sex hormone.

Several days ago, we were fortunate to get a tour of the gross anatomy lab here at Drexel University College of Medicine. And by gross, I don't mean disgusting - I mean what the medical world terms ...