The prostatic urethra courses the length of the prostate from the level of the bladder neck to the level of the membranous urethra. The epithelium consists of transitional cells similar to bladder epithelium. This transitional zone is where benign prostatic hyperplasia occurs and can lead to bladder outlet obstruction when an adenoma grows to a significant size. When the adenoma grows large enough, it can compress the fibromuscular band surrounding this zone, creating a surgical capsule.
The transitional zone is often described as having 2 lateral lobes and a median lobe that lead to the symptoms of the lower urinary tract symptoms. A urethral crest runs along the posterior midline and disappears at the membranous urethra. On both sides of the urethral crest, there is a grove where the prostatic sinuses exist and drain all of the glandular elements.
The urethral crest widens and protrudes from the posterior wall as the seminal colliculus (verumontanum). A small midline pit, the prostatic utricle, is found at the apex of the seminal colliculus. On either side of the utricular orifice, the small slitlike openings to the ejaculatory duct can be found.
The prostatic urethra courses the length of the prostate from the level of the bladder neck to the level of the membranous urethra. The epithelium consists of transitional cells similar to bladder epithelium. This transitional zone is where benign prostatic hyperplasia occurs and can lead to bladder outlet obstruction when an adenoma grows to a significant size. When the adenoma grows large enough, it can compress the fibromuscular band surrounding this zone, creating a surgical capsule.The transitional zone is often described as having 2 lateral lobes and a median lobe that lead to the symptoms of the lower urinary tract symptoms. A urethral crest runs along the posterior midline and disappears at the membranous urethra. On both sides of the urethral crest, there is a grove where the prostatic sinuses exist and drain all of the glandular elements.The urethral crest widens and protrudes from the posterior wall as the seminal colliculus (verumontanum). A small midline pit, the prostatic utricle, is found at the apex of the seminal colliculus. On either side of the utricular orifice, the small slitlike openings to the ejaculatory duct can be found.
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