
Renal papilla
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Renal papilla
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Vasa recta
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Papillary ducts of Bellini
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Area cribosa
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Minor calyx
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

- Lumen
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

- Transitional epithelium
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Renal sinus
The apex of the pyramid projects into the minor calyx as the renal papilla. The openings of the papillary ducts of Bellini empty into the lumen of the minor calyx, forming the area cribrosa. The minor calyx is lined by a transitional epithelium, which may be modified as it is reflected over the surface of the papilla. 200x

Area shown in next image
The area in the rectangle is shown at higher magnification in the next image.

Image source >
Image taken of a slide in the University of Iowa slide collection.