Cryptorchidism (over 90% in some studies). Even after orchiopexy, these may also affect sperm maturation and motility at an older age. The most common diagnostic dilemma in otherwise normal boys is distinguishing a retractile testis from a testis that will not descend spontaneously into the scrotum. Retractile testes are more common than truly undescended testes and do not need to be operated on. In normal males, as the cremaster muscle relaxes or contracts, the testis moves lower or higher ("retracts") in the scrotum. This cremasteric reflex is much more active in infant boys than older men. A retractile testis high in
The Lady, or the Tiger? with guilt or innocence decided by the result of chance. A person accused of a crime is brought into a public arena and must choose one of two doors. Behind one door is a lady whom the king has deemed an appropriate match for the accused; behind the other is a fierce, hungry tiger. Both doors are heavily soundproofed to prevent the accused from hearing what is behind each one. If he chooses the door with the lady behind it, he is innocent and must immediately marry her, but if he chooses the door with the tiger behind it, he