the anatomical structures for urine concentration found in animals living in desert or arid environments , although not all occurring in one particular animal , are wide medullae , long loops of henle , long proximal tubules , long collecting tubules , small renal corpuscles , extension of the renal pelvis , well developed elongated papillae , occurrence of giant vascular bundles , specialized ultrastructure of henle 's loops , epithelial changes in the collecting tubule , zonation of the vasa recta and peculiarity of the arterial supply to the kidney .
C0227666
renal pelvis
C0022646
kidney