The simple idea
The urinary system begins from intermediate mesoderm. Two temporary kidney forms appear first, but the permanent kidney is the metanephros, which starts around week 5.
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Part 3 · The Kidneys
Same concept, other depth: Clinical Reasoning →
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The urinary system begins from intermediate mesoderm. Two temporary kidney forms appear first, but the permanent kidney is the metanephros, which starts around week 5.
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