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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 12 - Urinary System

Plate 12.240 Kidney

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed

Papilla, area cribrosa, minor calyx

Plate 12.240 Kidney

Rhesus monkey, Helly's fluid, H. & E., 162 x.


Papillary ducts (of Bellini): Named after Lorenz Bellini, the Italian anatomist, who described them in 1662. Arise by convergence of collecting tubules in the medulla near the pelvis. These ducts have large lumina and open at the area cribrosa at the apex of the papilla. Note the tall columnar epithelium lining the ducts. Cytoplasm of epithelial cells is clear; nuclei are dark and basally located. The tops of cells tend to bulge into the lumen.

Minor calyx: Subdivision of a major calyx in the pelvis of the kidney. The minor calyx is an infolded tube forming a double-walled cup. The inner wall of the calyx fits over the papilla of a pyramid. The transitional epithelium of the minor calyx is continuous with the columnar epithelium of the papillary ducts. The lamina propria is made up mostly of collagenous connective tissue and lacks papillae.

Area cribrosa: The sieve-like appearance of the papilla is produced by the large number of collecting tubules passing through it.

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