[Anatomical study of double urethra in the child. 2 cases]

The supernumerary urethrae can be defined as supplementary channels of muscular structure, whose mucous lining is of the excretory urinary type. The present classification enables us to define three main types of supernumerary urethrae: the duplicated, the bifidated, the blind ducts with external or internal opening. It appears rather difficult to link the sum of these malformations with a common embryological anomaly. The origin of the bifidated may be explained by an anomaly of the closing of the urogenital gutter. On the other hand, a prolongation of the process of separation of the urorectal septum would be at the origin of the duplicated urethrae.