Diagnostic Ultrasound - Abdomen and Pelvis

Prostate
Anatomy: Pelvis
PROSTATE IN SITU
Urinary bladder
Seminal vesicle
Prostate
Prostatic urethra
Ejaculatory duct
Rectovesical septum
(Denonvilliers fascia)
Membranous urethra
Urogenital diaphragm
Bulbourethral (Cowper) gland
and duct
Urethral crest
Prostatic ducts
Ejaculatory duct orifice
Prostatic sinus
Verumontanum
Utricle orifice
Bulbourethral (Cowper) gland
(Top) Graphic illustrates the relationship between the prostate and the male pelvic organs. The prostate surrounds the upper part of the
urethra (prostatic urethra). The base of the prostate is continuous with the bladder neck and its apex is continuous with external
sphincter. The posterior surface is separated from the rectum by the rectovesical septum (Denonvilliers fascia). (Bottom) Graphic shows
the topography of the posterior wall of the prostatic urethra. The urethral crest is a mucosal elevation along the posterior wall, with
the verumontanum being a mound-like elevation in the midportion of the crest. The utricle opens midline onto the verumontanum, with
the ejaculatory ducts opening on either side. The prostatic ducts are clustered around the verumontanum and open into the prostatic
sinuses, which are depressions along the sides of the urethral crest.
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