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 duct
Nephrotome (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
Pronephric tubule Pronephros Time: 4th week Function: no Destiny: degeneration
Pronephric tubule Pronephros Time：4th week Function：no Destiny: degeneration
Mesonephros 14-18th somite Middle part of 80 transverse s nephrogenic cord shaped tubule le Mesonephric Mesonephric bule duct Continus pronephric duct Inner end Outer end bind The end bind form renal to mesonephric to cloaca capsule du Glomerulus
Mesonephric duct Middle part of nephrogenic cord Mesonephric tubule Inner end form renal capsule Glomerulus The end bind to cloaca 80 transverse Sshaped tubule Continus to pronephric duct Outer end bind to mesonephric duct 2. Mesonephros 14-18th somite
Time end of 4th week Function Mesonephric duct transient urinary Mesonephric tubu D estiny Most degeneration, Small part form male excurrent duct
Time ： end of 4th week Function: transient urinary Destiny: Most degeneration, Small part form male excurrent duct Mesonephric duct Mesonephric tubule
3. Metanephros o Time: begin at 5th week exist forever e Function: begin at 3th month, urinary function Position: rise gradually Metanephros
Time：begin at 5th week, exist forever Function：begin at 3th month, urinary function Position：rise gradually 3.Metanephros Metanephros