<prompt> Trigone of urinary bladder and posterior wall of urethra develop from -Urogenital sinusVesicourethral canalMesonephric ductParamesonephric duct  <response>: Ans. is c i.e., Mesonephric duct o The urinary bladder except trigone is derived from vesicourethral canal, cranial part of urogenital sinus endodermal. Trigone is derived from Absorbed part of Wolffian ductmesonephric duct mesodermal.o Development of urethra is as followsA Prostatic urethra and membranous urethra Anterior wall of prostatic urethra above the opening of prostatic utricle - from vesicourethral canal endoderm. Anterior wall of prostatic urethra below the opening of prostatic utricle and whole of the membranous urethra- from definite urogenital sinus endoderm Posterior wall of prostatic urethra - from mesonephricwolffian duct mesodermal.B Penile urethra Upto the glans - from phallic part of urogenital sinus endoderm. In the glans - from ectodermal urethral groove ectoderm. 