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The urethral crest is an anatomical feature present in the urinary system of both males and females. In males, the urethral crest is known as the ''crista urethralis masculinae, or the crista phallica, and is a longitudinal fold on the posterior wall of the urethra extending from the uvula of the bladder through the prostatic urethra.〔(【引用サイトリンク】title=Crista urethralis masculinae )〕 It is from 15 to 17 mm. in length, and about 3 mm. in height, and contains muscular and erectile tissue. When distended, it may serve to prevent the passage of the semen backward into the bladder.〔(【引用サイトリンク】title=Urethral Crest )〕 In females, it is known as the ''crista urethralis femininae'', and is a conspicuous longitudinal fold of mucosa on the posterior wall of the urethra.〔(【引用サイトリンク】title=Crista urethralis femininae )〕 ==Additional images== 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「Urethral crest」の詳細全文を読む スポンサード リンク
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