The above image shows a ventral view of the dorsal wall of a preserved male frog.  Structures of the urogenital system that can be seen include the left kidney (1), attached to which at its anterior end is an oval, cream colored testis (2). The (deflated) urinary bladder (3) can also be seen covering a portion of the posterior end of the left kidney. Although this is a male frog,  males of many species of frogs retain vestigial oviducts (4) that serve no actual purpose.  In females, of course, eggs are produced and retained within the oviducts until they are released during mating.  Other labeled structures include fat bodies (5), the stomach (6), the median lobe of the liver (7) and the left lung (8).