Intermediate Renal Medulla Quiz

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Q8. What is the area cribrosa?

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

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

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

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

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