The ureteral bud is a formation in the fetus during organogenesis of the urinary system . It arises near the cloaca from the urinary duct , in the human fetus around the 5th week of life. The ureteric bud grows around the cap-like system of the kidney , more precisely the metanephros ( metanephrogenes blastema ), where it induces the development of the actual kidney in amniotes . The ureteral bud then divides into two buds that partially fuse together.
- Karl-Josef Moll, Michaela Moll: Anatomy: Short textbook for the subject catalog 1. 18th edition. Elsevier, Urban & Fischer-Verlag, 2005, ISBN 3-437-41743-6 , p. 8.