Testicular cancer is cancer of the testicles.
But while you may know where they are and you may know a little bit about what they do, chances are that you don't know what is going on inside of them. This page is intended to be a very brief overview of the anatomy and function of the testicle. They are located behind the penis in a pouch of skin called the scrotum. The testicles produce sperm and testosterone . The testicles are located outside the body because sperm develop best at a temperature several degrees cooler than normal internal body temperature.