位于胃结肠静脉和回结肠静脉注入下腔静脉处之间的一段肠系膜上静脉被命名为“外科干”。

The segment of the superior mesenteric vein between the two confluences of the gastrocolic vein and ths ileocolic vein is called the "surgical trunk".

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结论：肠系膜上静脉外科干下端为回结肠静脉汇入点，上端为右侧距回结肠静脉最近的汇入点。

Conclusion: the lower part of the surgical trunk of the superior mesenteric vein is the abouchement of the ileocolic vein and the upper part was the nearest right abouchement from the ileocolic vein.

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