The prostatic urethra is the 3-4 cm part of the male urethra that passes through the prostate. It is the widest and most dilatable part. Its back wall carries a ridge (urethral crest) with a mound called the seminal colliculus, where the ejaculatory ducts and the prostatic utricle open.
| Location | Within the prostate, from the bladder neck to the apex of the prostate |
|---|---|
| Parts |
|
| Nerve Supply | Prostatic plexus |
| Blood Supply | Inferior vesical artery (prostatic branches); Middle rectal artery |
| Venous drainage | |
| Lymphatic drainage |
|
Conveys urine from the bladder and receives semen components from the ejaculatory ducts and prostatic ducts.
Enlargement of the prostate's transition zone squeezes this segment, causing the weak stream, hesitancy and frequency of benign prostatic hyperplasia. Transurethral resection of the prostate (TURP) cores out tissue around it, using the seminal colliculus as a landmark to protect the external sphincter just below. The prostatic ducts open into grooves beside the crest.
Prostate enlargement compresses the prostatic urethra, causing lower urinary tract symptoms and sometimes urinary retention.
Inflammation of the prostate that can irritate the prostatic urethra, causing painful urination and pelvic pain.
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