Methods25normal skull were used to investigate the configurations of IOF and IOG.

方法正常颅骨25个，肉眼观察眶下裂和眶下沟解剖形态。

Objective To show imaging findings of inferior orbital fissure(IOF)and groove(IOG)on axial CT scans and to discover their anatomic variations, so as to avoid misdiagnosing them as orbital fracture.

目的研究正常人眶下裂和眶下沟横断面CT表现及其解剖基础，避免将其误认为眶壁骨折。