1. 
   Lacuna magna
   In male anatomy, the lacuna magna (also called Guérin`s sinus) is the largest of several recesses in the roof of the navicular fossa of the urethra. Its embryologic origin is contested, but recent evidence suggests it and the navicular fossa derive from infiltrating endodermal cells of the urethra...
   Found op http://en.wikipedia.org/wiki/Lacuna_magna
   
   
2. 
   lacuna magna
   Type: Term Definitions: 1. a recess on the roof of the fossa navicularis of the penis, formed by a fold of mucous membrane, the valve of the navicular fossa.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=47618
   
   
3. 
   lacuna magna
   A recess on the roof of the fossa navicularis of the penis, formed by a fold of mucous membrane, the valve of the navicular fossa. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?lacuna+magna
   
   

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