Prostatic urethra

The prostatic urethra, the widest and most dilatable part of the urethra canal, is about 3 cm long.Lobes of prostateZones of prostateStructure of the penisVertical section of bladder, penis, and urethra.Vesiculæ seminales and ampullæ of ductus deferentes, seen from the front. The prostatic urethra, the widest and most dilatable part of the urethra canal, is about 3 cm long. It runs almost vertically through the prostate from its base to its apex, lying nearer its anterior than its posterior surface; the form of the canal is spindle-shaped, being wider in the middle than at either extremity, and narrowest below, where it joins the membranous portion. A transverse section of the canal as it lies in the prostate is horse-shoe-shaped, with the convexity directed forward.