The prostatic urethra, the widest and most dilatable part of the urethra canal, is about 3cm 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.

The keyhole sign, in ultrasound, is associated with a dilated bladder and prostatic urethra.

Additional images

References

External links

• - "The Male Pelvis: The Prostate Gland"

• Chronic Prostatitis - Four Major Symptoms and Three Lifestyle To Follow