But medical information is always changing, and some information given here may be out of date. For regularly updated information on a variety of health topics, please visit familydoctor.org , the AAFP patient education Web site. An article on this topic is available in this issue of AFP .
Testicles are part of the male body.
They make male hormones and sperm. Usually both testicles are inside the scrotum. While boy babies are still growing inside the uterus, the testicles are inside the abdomen. They usually move down into the scrotum just before or just after birth. An undescended testicle is one that did not move down into the scrotum.