Notes on the Renal System and Nephron Structure

Renal Pyramids

• Structures within the kidneys, resembling lobes found in other organs such as the liver.
• Serve to channel urine from the nephrons to the renal pelvis.
• Each pyramid contains renal columns, consisting of collecting ducts and blood vessels.

Septa

• Structures that separate the inside of organs into lobes.
• In the context of the kidneys, septa divide the lobes associated with renal pyramids.

Medulla and Cortex

• The pyramids are located in the renal medulla, with the renal cortex surrounding it.
• Nephrons, crucial functional units of the kidney, reside primarily within the renal cortex.

Nephrons

• Functional units of the kidney responsible for filtering blood and producing urine.
• Located in the renal cortex, they filter waste from the blood and regulate various compounds.
• Blood filtration begins at the glomerulus, part of the nephron, and continues through various tubular segments.

Renal Hilium

• The indent in the kidney where the renal artery and vein enter and exit.
• Also serves as the entry point for the ureter, which transports urine from the kidney.

Renal Pelvis

• Collecting structure at the center of the kidney where urine gathers before it flows into the ureter.
• Minor calyces collect urine from the renal pyramids, converging into major calyces before entering the renal pelvis.

Collecting Ducts

• Located within the renal pyramids, they receive filtrate from nephrons.
• Converge to form a single