Central Zone – BPH Zone The diagram reflects the basic histological makeup of the prostate in axial projection and the focus of this diagram is on the transitional zone which contains the periurethral region, consisting of tissues of ductal and stromal origin but devoid of significant glandular tissue. It contains the prostatic urethra (orange) and the small posterior diverticulum like structure off the urethra called the prostatic utricle. Hyperplasia in the transitional zone will impinge on the urethra and result in the symptoms of prostatism usually due to BPH. CODE prostate normal stroma glands peripheral zone glandular tissue central zone ejaculatory ducts normal histology Davidoff Art Image Courtesy Ashley Davidoff Copyright 2011