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PPC OMM Block 8 Practice Exam
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Which of the following ranges is associated with sympathetic innervation of GI organs proximal to the ligament of Treitz?
T1-T4
T9-T11
T5-T9
T12-L2
Reveal Answer
Correct Answer:
T5-T9
Explanation:
The key idea is that foregut structures (proximal to the ligament of Treitz) get sympathetic input mainly from the greater splanchnic nerve, which originates from spinal levels T5 through T9. These preganglionic fibers ascend to the celiac ganglion, synapse there, and postganglionic fibers ride along the celiac trunk to innervate the stomach, liver, pancreas, spleen, and proximal duodenum. So this T5–T9 range precisely matches the sympathetic supply to those foregut organs. Other ranges correspond to different regions: higher levels relate to head/neck and upper limbs, while T9–T12 or T12–L2 align with midgut and hindgut via lesser and lumbar splanchnic nerves.
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