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 Excursions of Mr. Brouček to the Moon and to the 15th Century whether instrumental, vocal, or both, are motives. An example of a motive in "Brouček" is the use of high violins and flutes punctuating a pedal point a half step apart (Part 1) to indicate the moon up in the heavens where Brouček imagines he can escape from the cares of the world. Although for the most part, motives behave like motifs, and are quite similar in their usage, Janáček would have thought of them separately. A third and larger building block in "Brouček" is what Dieter Stroebel calls a melos, which describes a segment of music that is longer and