Renal columns are best described as which of the following?

• A. Tissue of the cortex located between renal pyramids for support and separation
• B. The tube that transports urine from the kidney to the bladder
• C. A layer of muscle surrounding the kidney
• D. The functional filtering units of the kidney

Answer: (A)

Renal columns are bands of cortical tissue that extend into the medulla between the renal pyramids, providing structural support and a pathway for blood vessels to reach the inner parts of the kidney. This matches the description of tissue of the cortex located between renal pyramids for support and separation. The tube that transports urine from the kidney to the bladder is the ureter, not part of the kidney’s internal anatomy. The kidney is not described as having a muscular layer around it; surrounding it are a fibrous capsule and perirenal fat, while the tube for urine transport is the ureter. The functional filtering units are nephrons, not the columns. So renal columns are the cortical tissue between pyramids that helps anchor the kidney’s internal framework and vessels.