The colliculus seminalis can be seen as a median elevation, located dorsally, in the pelvic urethra. The two slit openings are the ejaculatory ducts where the joined ducts of the ampullae and vesicular glands enter the urethra. The external sphincter of the urethra, leading to the bladder, can be seen just past the seminal colliculus. The openings to the prostatic ducts are also visible at the upper right hand corner of this image, on the lateral wall of the urethra. The striated, reddened appearance of the urethra is normal and should not be confused with inflammatory processes.
King AC (2008)