<prompt> Trigone of urinary bladder develops fromUrogenital sinusVesicourethral canalMesonephric ductEndoderm  <response>: The terminal poion of Mesonephric duct gets absorbed into the posterior wall of urogenital sinus and forms the trigone of the urinary bladder. Urinary bladder develops from endodermal vesicourethral canal. Ref: Grays 39ep-1289 