Lacuna magna | |
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![]() The male urethra laid open on its anterior (upper) surface, lacuna magna labeled near the glans penis (bottom). | |
Details | |
Identifiers | |
Latin | lacuna magna |
Anatomical terminology |
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 male urethra.
The lacuna magna is a large recess in the roof of the navicular fossa of the male urethra.[1]
The embryological origin of the lacuna magna is contested.[2] However, recent evidence suggests it and the navicular fossa of the male urethra derive from infiltrating endodermal cells of the urethral plate.[2]
In young males, the presence of the lacuna magna is associated with painful urination (dysuria), bloody urine (hematuria), and bloody spotting of underwear.[3][4]