Figure 84

Simple and compound papillae are illustrated [8,9]. Two types of renal papillae have been identified. Simple papillae are the most common type. They have slitlike papillary duct openings on their convex surface. These papillae are compressed by increases in pelvic pressure, preventing urine from entering the papillary ducts (intrarenal reflux). Compound papillae are formed by the fusion of two or more simple papillae. In compound papillae, some ducts open onto a flat or concave surface at less oblique angles. Increased intrapelvic pressure may permit intrarenal reflux. Compound papillae usually are found in the renal poles.

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