What structure separates the medulla from the cortex in the kidney?

What structure separates the medulla from the cortex in the kidney?

• A. Acute arteries
• B. Interlobar arteries
• C. Arcuate arteries
• D. Renal arteries

Answer: (A)

The boundary between the cortex and medulla is at the corticomedullary junction. Arcuate arteries lie right at this border, curving along the base of the renal pyramids and marking the division between outer cortex and inner medulla. They effectively separate the two regions. Interlobar arteries travel through the medullary columns toward the boundary but don’t define the separation, and renal arteries are just the main blood supply. The term acute arteries isn’t a standard structure, so the arcuate arteries at the corticomedullary junction are the best fit for separating the cortex from the medulla.

The boundary between the cortex and medulla is at the corticomedullary junction. Arcuate arteries lie right at this border, curving along the base of the renal pyramids and marking the division between outer cortex and inner medulla. They effectively separate the two regions. Interlobar arteries travel through the medullary columns toward the boundary but don’t define the separation, and renal arteries are just the main blood supply. The term acute arteries isn’t a standard structure, so the arcuate arteries at the corticomedullary junction are the best fit for separating the cortex from the medulla.