Anatomy and Embryology:
In embryo, urinary system develops in 3 attempts (pronephros, mesonephros, metanephros).
Pronephros is replaced by mesonephros.
Metanephros utilizes only the distal mesonephric duct to complete the development of urogenital system.
Metanephros forms kidney with nephrons, renal pelvis, ureter, urinary bladder and urethra.
Mesonephros forms gonads, vas deferens, seminal vesicle, and ejaculatory duct.
Prostate is developed from the proximal part of urethra and composed of urethral (metanephros), urogenital sinus, mesonephros and paramesonephric tissue.