Final answer:
Cryptorchidism is the condition where one or both testes do not descend into the scrotum before birth, potentially leading to reduced fertility due to the higher internal body temperature.
Step-by-step explanation:
Cryptorchidism defines a condition where one or both testes fail to descend from the abdomen into the scrotum before birth. It is not related to stones, impotence, or undeveloped testes. An important aspect to consider is that the testes are responsible for producing sperm, and maintaining them outside the body is essential for sperm viability because the optimal temperature for sperm development is slightly lower than body temperature. If testes do not descend, as seen in cases of cryptorchidism, this can lead to a reduction in fertility as the temperature inside the body is too high for sperm to effectively mature.
Furthermore, there are several conditions and diseases affecting the male reproductive system, such as testicular cancer and prostate cancer, where a biopsy is significant for proper diagnosis. Moreover, the development of the male or female reproductive system is influenced by genetic factors like the SRY expression on the Y chromosome. This expression is crucial in the biological differentiation of the sexual organs during embryonic development.