The male urethra extends from the internal urethral orifice to the external urethral orifice and can be described in 4 parts:
In the male the relations of the bladder are:
Superior : Peritoneum.
Inferolateral surfaces : Levator ani.
Inferior : Ductus deferens, pubic bones, obturator internus, levator ani.
Fundus : Rectum.
Bladder neck : Prostate, with seminal vesicles posteriorly.
"The seminal vesicles are located between the fundus of the bladder and the rectum, superior to the prostate.
Note: Above these is a reflection of peritoneum - the rectovesical pouch.
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The prostate can be described in lobes:
Anterior lobe : Anterior to the urethra; primarily fibromuscular.
Posterior lobe : Posterior to the urethra; this is the part palpated on digital rectal examination.
Lateral lobes : Form the bulk of the prostate.
Median lobe : Between the urethra and ejaculatory ducts, close to the bladder neck.
"The most common prostatic malignancy is adenocarcinoma, with 75% occurring in the peripheral zone of the prostate.
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