Which vessels receive blood directly from the interlobar arteries?
AThe arcuate arteries
BThe segmental arteries
CThe afferent arterioles
DThe cortical radiate arteries
Answer & Solution
Correct answer: A. The arcuate arteries
1. Blood enters at the renal artery, which divides first into segmental arteries.
2. The segmental arteries branch into interlobar arteries, which pass through the renal columns to reach the cortex.
3. The interlobar arteries then branch into arcuate arteries.
4. The arcuate arteries branch into cortical radiate arteries, and only then into afferent arterioles.
5. So the vessel immediately downstream of the interlobar artery is the arcuate artery.
6. Segmental arteries lie upstream of the interlobar arteries, so they cannot receive blood from them.
7. Cortical radiate arteries and afferent arterioles both sit two or more steps further along the chain.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.3 Gross Anatomy of the Kidney_
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