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The Renal Pelvis: Machinery That Concentrates Urine in the Papilla

Terry M. Dwyer¹ and Bodil Schmidt-Nielsen²

¹ Department of Physiology and Biophysics and Center for Excellence in Cardiovascular-Renal Research, University of Mississippi Medical Center, Jackson, Mississippi 30216-4505; and
² Department of Physiology, University of Florida, Gainesville, Florida 32608
Two decades ago, Bodil Schmidt-Nielsen and Bruce Graves documented the rhythmic contractions of the renal pelvis in a remarkable video, visually demonstrating how peristaltic waves empty the papilla and how the subsequent elastic recoil draws water from the collecting duct and into the tethered-open ascending vasa recta. Thus a periodic hydrostatic gradient generates an axial osmotic gradient. This review recapitulates the video and offers a link to figures and scenes digitized from the original tape.

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