
Renal papilla
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

Renal papilla
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

- Papillary ducts
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

- Opening of papillary duct
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

- Vasa recta
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

- Area cribrosa
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

Minor calyx
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

Minor calyx lumen
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

Transitional epithelium
Papillary ducts of Bellini discharge urine into the lumen of a minor calyx, forming a perforated region of the papilla called the area cribrosa. The minor calyx is continuous with a major calyx, which continues into the renal pelvis. In general, these excretory passages are lined by transitional epithelium resting on a thin lamina propria and a double layer of smooth muscle. 200x

Area shown in next image >
The area indicated by 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.