Here's a more detailed explanation:

* Early development: The primordial germ cells, which will become the sperm-producing cells in the testes, originate in the yolk sac and migrate to the developing gonads (future testes or ovaries).

* Migration to the abdomen: These primordial germ cells reach the gonads in the abdominal cavity, where they interact with the surrounding cells to form the testes.

* Descent: During fetal development, the testes typically descend from the abdomen into the scrotum, a pouch of skin located outside the body. This descent is crucial for proper sperm development and function.

Important Note: While the testes are formed in the abdomen, their final location is the scrotum.