Definition: an outgrowth from the caudal portion of the mesonephric duct on either side, which grows cephalodorsally to make contact with the masses of metanephrogen tissue (nephric blastemas) and give rise to the epithelial lining of the ureter and of the pelvis and the collecting ducts of the kidney.
Synonym(s): metanephric bud, ureteric bud
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