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Figure 2: Course of the ethmoidal artery in orbit. The brown line represents the course of the anterior ethmoidal artery entering into the ethmoid sinus through the anterior ethmoidal foramen. The orange line indicates the course of the middle ethmoidal artery entering into the ethmoid sinus through the middle ethmoidal foramen. The blue line represents the posterior ethmoidal artery entering into the ethmoid sinus through the posterior ethmoidal foramen. PEF, posterior ethmoid foramen. AEF, anterior ethmoid foramen. MEF, middle ethmoid foramen. AE, anterior ethmoid sinus

Figure 2: Course of the ethmoidal artery in orbit. The brown line represents the course of the anterior ethmoidal artery entering into the ethmoid sinus through the anterior ethmoidal foramen. The orange line indicates the course of the middle ethmoidal artery entering into the ethmoid sinus through the middle ethmoidal foramen. The blue line represents the posterior ethmoidal artery entering into the ethmoid sinus through the posterior ethmoidal foramen. PEF, posterior ethmoid foramen. AEF, anterior ethmoid foramen. MEF, middle ethmoid foramen. AE, anterior ethmoid sinus