In frogs, sperm are carried from seminiferous tubules to the Bidder's canal by

In frog, each testis is composed of numerous seminiferous tubules, where the sperms are produced. They are connected to 10-12 vasa efferentia which emerge from testis, run through the mesorchium and enter the kidneys of their side. In kidneys, these open into Bidder’s canal, which finally communicates with the urinogenital duct through the transverse canals, which comes out of the kidneys and opens into the cloaca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior.