The testes are a very important reproductive organ in the human body. Usually, there are two testes in normal adults, which are located in the scrotum and are relatively superficial. The role of the testes is mainly reflected in two aspects: First, the testes have the function of sperm production, human semen is produced in the testes, there are many testicular lobules in the testes, there are many varicose seminal ducts in the lobules. The epithelial cells of the seminiferous tubules are important parts of sperm production, and after sperm production, they are transported via the ureter to the seminal vesicles for temporary storage. Another function of the testes is to produce androgens, which is a very important hormone for the human body and is very important for maintaining male sexual characteristics. Therefore, the testes are not only the organ that produces sperm, but also produce androgens to maintain male secondary sexual characteristics.