In the female, a conspicuous longitudinal fold of mucosa on the posterior wall of the urethra.
In the male, a longitudinal fold on the posterior wall of the urethra extending from the uvula of the bladder through the part of the urethra that tranverses the bladder.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.