The prostatic urethra, the widest and most dilatable part of the urethra canal, is about 3 cm long.
The male urethra laid open on its anterior (upper) surface. (Prostatic part labeled at upper right.)
|Latin||pars prostatica urethrae|
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.
The keyhole sign, in ultrasound, is associated with a dilated bladder and prostatic urethra.
- Lobes of prostate
- Zones of prostate
- Structure of the penis
- Vertical section of bladder, penis, and urethra.
- Vesiculæ seminales and ampullæ of ductus deferentes, seen from the front.
- Anatomy image: malepel2-4 at the College of Medicine at SUNY Upstate Medical University
- Cross section image: pelvis/pelvis-e12-15—Plastination Laboratory at the Medical University of Vienna
- Anatomy photo:44:05-0201 at the SUNY Downstate Medical Center - "The Male Pelvis: The Prostate Gland"