Several large collecting ducts approach the end of a medullary pyramid (i.e., close to their opening into the pelvis). The transitional epithelium of the renal pelvis is continuous with that of the ureters and bladder.
Historical note: Collecting ducts may also be called "ducts of Bellini," after Lorenzo Bellini, the 17th century Italian anatomist who first described them.
Click on thumbnail to left for a higher magnification image of a collecting duct.
Click on thumbnail to right for higher magnification of transitional epithelium.
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https://histology.siu.edu/crr/RN012b.htm
Last updated: 30 May 2022 / dgk