Urethra
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The urethra is the tube that transports urine from the bladder to the urethral meatus of the penis or vulva in placental mammals. In males, it also transports semen through the penis during ejaculatio
The urethra transports urine from the bladder to the outside of the body. This image shows (a) a human female urethra and (b) a human male urethra.
Micrograph of urethral cancer (urothelial cell carcinoma), a rare problem of the urethra.
Female urethral opening within vulval vestibule
Urethra. Deep dissection. Serial cross section.
Seminal vesicles
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The seminal vesicles are a pair of convoluted tubular accessory glands that lie behind the urinary bladder of male mammals. They secrete fluid that largely composes the semen.
Histology of seminal vesicle glands on H&E stain. They may mimic prostatic adenocarcinoma by crowded glands with enlarged hyperchromatic and irregular nuclei, but will have inconspicuous nucleoli and coarse refractile golden brown lipofuscin granules.
Low magnification micrograph of seminal vesicle. H&E stain.
High magnification micrograph of seminal vesicle. H&E stain.
Seminal vesicles seen on an MRI scan through the pelvis. The large cyan-coloured area is the bladder, and the lobulated smaller structures below it are the vesicles.