Intermediate Renal Medulla Quiz

Q1. Which two broad zones are recognized within the renal medulla?

• Hilar and capsular zones
• Outer medulla and inner medulla
• Superior cortex and inferior cortex
• Anterior medulla and posterior medulla

Q2. Which nephron type has loops of Henle that extend deepest into the renal medulla?

• Juxtamedullary nephrons
• Superficial cortical nephrons only
• Collecting ducts
• Renal corpuscles

Q3. Which vessels descend into the medulla alongside long loops of Henle?

• Cortical radiate arteries
• Vasa recta
• Segmental veins
• Renal capsular vessels

Q4. What is the role of the vasa recta in medullary physiology?

• They drain urine into the renal pelvis
• They help preserve the medullary osmotic gradient by countercurrent exchange
• They perform glomerular filtration
• They form the renal capsule

Q5. Which portion of the loop of Henle is highly permeable to water?

• Thick ascending limb
• Distal convoluted tubule
• Papillary duct only
• Thin descending limb

Q6. Which segment actively reabsorbs sodium, potassium, and chloride while being relatively impermeable to water?

• Minor calyx
• Glomerular capsule
• Thin descending limb
• Thick ascending limb

Q7. What happens to collecting ducts as they approach the renal papilla?

• They form renal corpuscles
• They become renal arteries
• They enter the renal vein
• They converge into papillary ducts

Q8. What is the area cribrosa?

• The wall of the renal pelvis
• The fibrous surface of the renal capsule
• The perforated papillary surface containing papillary duct openings
• The origin of the renal artery

Q9. Which vessels are found near the bases of renal pyramids at the corticomedullary junction?

• Hepatic vessels
• Inferior phrenic vessels
• Gonadal vessels
• Arcuate vessels

Q10. Why does the medulla normally receive less blood flow than the cortex?

• The medulla contains no blood vessels
• The medulla is outside the kidney
• All renal blood bypasses the medulla
• Lower flow helps preserve the medullary osmotic gradient