What are the three strictures in the male urethra?

The three narrow parts of the male urethra usually refer to the external urethral orifice, the internal urethral orifice, and the membranous urethra.

The external urethral orifice is a longitudinal slit, which is a common channel for urination and semen. It is generally closed. When urine passes through, it will be ejected from the external urethral orifice.

The internal urethral orifice is generally located at the connection between the prostate part of the urethra and the bladder, and is usually surrounded by the bladder neck and prostate base.

The membranous urethra is the narrowest section of the male urethra. It is usually surrounded by the external urethral sphincter and is relatively thin, making it prone to urethral damage.

When abnormalities occur in the three strictures of the male urethra, timely treatment is required according to medical advice.