An inconstant fold or valve of mucous membrane sometimes found in the root or upper wall of the navicular fossa of the urethra [ MP:0011839 http://www.drugs.com/dict/valve-of-navicular-fossa.html MP:anna ]

Synonyms: urethral valve of Guérin Guérin's fold Guérin's valvule Guerin's valve valvula fossae navicularis valve of fossa navicularis of urethra

This is just here as a test because I lose it