ureteric bud

anatomy

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July 14, 2026

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The ureteric bud is a crucial component in the development of the permanent kidney, known as the metanephros, in reptiles, birds, and mammals. This bud originates as a dorsal outgrowth of the mesonephric duct and grows towards the mesenchyme, eventually forming the ureter. As it branches within the mesenchyme, it gives rise to the collecting tubules of the kidney. The mesenchyme, influenced by the ureteric bud's branches, then aggregates to form the excretory tubules. The development of these excretory tubules is dependent on the ureteric bud; if it fails to develop or reach the mesenchyme, no kidney will form.12

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animal development
Excretory organs
…the mesonephric duct, called the ureteric bud. The ureteric bud grows in the direction of the mesenchyme and becomes the ureter. Having penetrated the mass of mesenchyme, it starts to branch, producing the collecting tubules of the kidney; the mesenchyme, meanwhile, in response to the influence of the duct and…
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…the mesonephric duct, called the ureteric bud. The ureteric bud grows in the direction of the mesenchyme and becomes the ureter. Having penetrated the mass of mesenchyme, it starts to branch, producing the collecting tubules of the kidney; the mesenchyme, meanwhile, in response to the influence of the duct and…
Read More