part_of part of part of renal system embryonic structure genitourinary system nephric ridge EHDAA:1015 EHDAA2:0001242 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. UBERON:0005792 nephric cord uberon EMAPA:16368 TODO - check ridge vs cord vs nephrogenic cord vs blastema VHOG:0001240