Renal pelvis

Definition

The renal pelvis is a funnel-shaped structure in the kidney that collects urine from the calyces and channels it into the ureter. It is an essential part of the urinary system's drainage mechanism.

5 Must Know Facts For Your Next Test

1. The renal pelvis receives urine from the major and minor calyces in the kidney.
2. It acts as a conduit for urine to travel from the kidney to the ureter.
3. Obstruction or infection in the renal pelvis can lead to conditions like hydronephrosis or pyelonephritis.
4. The renal pelvis is lined with transitional epithelium, which allows it to stretch as it fills with urine.
5. Kidney stones can form in the renal pelvis and cause severe pain when they obstruct urine flow.

Review Questions

• What role does the renal pelvis play in urine transport?
• Name two conditions that can affect the renal pelvis.
• Describe the type of epithelium lining the renal pelvis and its significance.

Related terms

calyx: A chamber in the kidney where urine passes before reaching the renal pelvis.

ureter: A tube that carries urine from the renal pelvis of each kidney to the bladder.

hydronephrosis: Swelling of a kidney due to a build-up of urine, often caused by an obstruction in the urinary tract.