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.
Additional images
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.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
