Figure 14.10 A to C. Ascent of the kidneys. Note the change in position between the mesonephric and metanephric systems. The mesonephric system degenerates almost entirely, and only a few remnants persist in close contact with the gonad. In both male and female embryos, the gonads descend from their original level to a much lower position. D. Scanning electron micrograph of a mouse embryo showing the kidneys in the pelvis. B, bladder; K, kidney A, adrenal gland; G, gonad; T, tail.
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