Drugs acting on the urinary system.
The development of the reproductive organs is so closely interwoven with that of the urinary that some reference from this article to that on the Urinary System is necessary.
The early history of these ducts is indicated in the article on the Urinary System.
The part of the urethra above the openings of these ducts really belongs to the urinary system only, though it is convenient to describe it here.
Cystoscopy (looking into the bladder with a thin telescope-like instrument) and x rays with a contrast agent to illuminate the urinary system will usually identify the defect.