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Figure 1: Schematics of position variation of the anterior and posterior ethmoidal canal (Sagittal section). The anterior ethmoidal canal was located in the bony plate of the anterior ethmoid roof (A), between the anterior ethmoid roof and the ethmoid sinus mucosa (B), and in the anterior ethmoid cells (C). The posterior ethmoidal canal was located in the bony plate of the posterior ethmoid roof (D), between the posterior ethmoid roof and the ethmoid sinus mucosa (E), and in the posterior ethmoid cells (F)

Figure 1: Schematics of position variation of the anterior and posterior ethmoidal canal (Sagittal section). The anterior ethmoidal canal was located in the bony plate of the anterior ethmoid roof (A), between the anterior ethmoid roof and the ethmoid sinus mucosa (B), and in the anterior ethmoid cells (C). The posterior ethmoidal canal was located in the bony plate of the posterior ethmoid roof (D), between the posterior ethmoid roof and the ethmoid sinus mucosa (E), and in the posterior ethmoid cells (F)