Nephric tubules (nephrons) form embryonically along the nephric ridge. The ridge comprises three regions; anterior, middle and posterior. The functional kidney uses nephrons from only one or two regions of the ridge. A pronephric kidney uses only the nephrons from the anterior region of the ridge. A mesonephric kidney uses only the middle region, a metanephric kidney uses only the posterior region and an opisthonephric kidney uses the middle and posterior regions. [ ]

This is just here as a test because I lose it

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editor note

TODO - check ridge vs cord vs nephrogenic cord vs blastema

has related synonym

nephric cord