The posterior urethra is a component of the male urethra, which can be clinically divided into two parts: the anterior urethra and the posterior urethra, due to the long male urethra. The anterior urethra is usually referred to as the urethra of the penis and the urethra of the bulb, while the posterior urethra is usually referred to as the urethra of the prostate and the urethra of the membrane in men. The posterior urethra is usually relatively short, and the posterior urethra usually has openings for the transurethral and ejaculatory ducts, which communicate with the posterior urethra. Some of the common disorders of the posterior urethra are mainly due to trauma when the pelvis is fractured, which can easily cause a rupture of the membranous urethra. In addition, if there is prostatic hyperplasia, it tends to compress the posterior urethra, causing narrowing of the posterior urethral canal, which causes bladder outlet obstruction, causing difficulty in urination and other clinical symptoms to occur.