The descend of testis Testes follow the"path of descent "from high in the posterior fetal abdomen to the inguinal ring and beyond to the inguinal canal and into the scrotum In most cases(97% full-term, 70% preterm), both testes have descended by birth. In most other cases, only one testis fails to descend (cryptorchidism and that will probably express itself within a year Internal (deep)ring External(superficial) ring Darto Cremaster muscle Internal spermatic fascia TunIca vaginalis(parietal Undescended Testes(Cryptorchidism) a testis that did not descend all the way into the scrotumThe descend of testis Testes follow the "path of descent" from high in the posterior fetal abdomen to the inguinal ring and beyond to the inguinal canal and into the scrotum. In most cases (97% full-term, 70% p) y reterm), both testes have descended b y birth. In most other cases, only one testis fails to descend (cryptorchidism) and that will probably express itself within a year. Undescended Testes ( yp ) Cr torchidism) - a testis that did not descend all the way into the scrotum