Renal papilla and calyx, a. This scanning electron micrograph shows the conical structure that represents the renal papilla, projecting into the renal calyx. The apex of the papilla contains openings (arrows) of the collecting ducts (of Bellini). These ducts deliver urine from the pyramids to the minor calyx. The surface of the papilla containing the openings is designated the area cribrosa. (Courtesy of C. Craig Tisher.) b. Photomicrograph of a H&E-stained specimen of the papilla, showing the distal portion of the collecting ducts opening into the minor calyx. xl20.
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