<prompt> True about prostatic urethra are all exceptTrapezoid in cross-sectionPresence of verumontanumOpening of prostatic ductsContains urethral crest  <response>: Prostatic urethra When working properly, it prevents the urine until it is time to get the semen back into the bladder during ejaculation stops. If damaged, the semen is forced back into the bladder and prostatic urethra finally leaving the normal . Ref - BDC 6e Vol2 , researchgate.net 