Prostatic urethra is that part of male urethra that runs through the prostate gland from its base to its apex. It is about 1.25 inches in length and begins at the neck of the bladder. At the apex of the prostate, it becomes continuous with the membranous part of the urethra.
Prostatic urethra is the widest and most dilatable part of entire male urethra. On its posterior wall, there is a ridge called urethral crest, on each side of which lies a groove called prostatic sinus. The ducts of the prostate gland open into these prostatic sinuses.
On the summit of the urethral crest, there is a depression called the prostatic utricle. This utricle is the male analogue of uterus and vagina of females. On the edge of the mouth of the utricle are the openings of the two ejaculatory ducts.