Urethral crest

The urethal crest is an anatomical feature present in the urinary system of both males and females.

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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..^[1] 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.^[2]

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.^[3]

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References

1. ^ http://www.biology-online.org/dictionary/Crista_urethralis_masculinae
2. ^ http://education.yahoo.com/reference/gray/subjects/subject?id=256#p1234
3. ^ http://www.biology-online.org/dictionary/Crista_urethralis_femininae