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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== File:Illu prostate lobes.jpg|Lobes of prostate File:Illu prostate zones.jpg|Zones of prostate File:Illu penis.jpg|Structure of the penis File:Gray1156.png|Vertical section of bladder, penis, and urethra. File:Prostate - Gray1153.png|Vesiculæ seminales and ampullæ of ductus deferentes, seen from the front. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「prostatic urethra」の詳細全文を読む スポンサード リンク
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