结论：筛动脉的起始及眶内走行多变异，筛后动脉变异较筛前动脉多见。
Conclusion: the origin and intraorbital course of the ethmoidal artery is variable, which is more common in the posterior ethmoidal artery than in the anterior ethmoidal arteries.
结论：筛动脉的起始及眶内走行多变异，筛后动脉变异较筛前动脉多见。
Conclusion: the origin and intraorbital course of the ethmoidal artery is variable, which is more common in the posterior ethmoidal artery than in the anterior ethmoidal arteries.
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