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Plane of the infraorbital nerve (ION) and zygomaticofacial nerve (ZFN) course. The ION and ZFN run superficially to the periosteum within and beneath the epimysium of the orbicularis oculi muscle (OOM) and then perpendicularly through the OOM and they are distributed to the skin. N: nerve, OS: orbital septum (Hwang et al., 2008).
