Descent of the Testis Embryology Diagram

Descent of the testis embryologically begins near kidneys at 7-8 weeks, guided by gubernaculum through inguinal canal (transabdominal phase via genitofemoral nerve), then inguinoscrotal phase (hormone-driven, testosterone/insulin-like factor 3) into scrotum by 28-32 weeks. Failure leads to cryptorchidism.