Development of urinary system Development of kidney and ureter 1. Pronephros 4th week Nephrotome (7-14th Somite) Pronephric Pronephric ubule duct Degeneration Mesonephric in 1 week ductNephrotome (7-14th Somite) Pronephric tubule Pronephric duct Degeneration in 1 week Mesonephric duct Development of urinary system Development of kidney and ureter 1. Pronephros 4th week