The analysis of the caliceal cavities of 30 pairs of Kidneys shows a dichotomous distribution of two types: cranio-caudal for the major calices, ventro-dorsal for the minor ones. The dichotomous organization does not result from the initial division of the ureteral bud: but it should depend upon the renal arteries growth commanding a new caliceal pattern during the morphogenesis of the Kidney.
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