6 the medulla consists of numerous conical structures

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6. The medulla consists of numerous conical structures called renal pyramids. The base of each pyramid lies next to the cortex,while the tip forms a renal papilla. Each papilla projects into the renal sinus. Locate the renal pyramids, renal papilla, and renal sinus. 7. Renal pyramids are separated by bands of tissue called renal columns. Each column begins in the cortex and extends through the medulla. Examine the texture of this tissue. Columns have a granular texture similar to that of the cortex. 8. Each renal pyramid and adjacent cortical region make up a renal lobe. Urine production occurs in the renal lobes. Each renal papilla discharges urine into a cup-shaped minor calyx. Four or five minor calyces merge to form a major calyx. Major calyces merge to form the renal pelvis. Using a probe, trace the path of urine from the renal pyramids to the renal pelvis. 9. Examine the renal pelvis. It is formed by a wall of thick fibrous tissue and forms the expanded end of the ureter. 10. Using a scalpel, carefully cut one wall of the ureter and extend the incision to the hilus. The ureter is continuous with the renal pelvis. Observe the fine ridges on the endothelial lining of the ureter and renal pelvis. 11. Once you have observed all the structures of the kidney, dispose of the specimen in accordance with local guidelines and your teacher’s instructions.
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Glossary Calyx - cup-like division found in the renal medulla; minor calyces (plural) empty into major calyces. Hilus - depression where the renal artery, renal vein, and ureter enter and exit the kidney. Renal artery - branch from the abdominal aorta that supplies the kidney with oxygenated blood.
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  • Fall '12
  • Mr.Castellani
  • Renal artery, Renal vein

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