英语语法分析

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.

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。