| 1. | The openings to the posterior ethmoidal sinuses exist under the superior meatus.
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| 2. | It is the thinnest wall of the orbit, evidenced by pneumatized ethmoidal cells.
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| 3. | It is the gloomy area beneath the lac ( rimal ) and ethmoidal bones in the image.
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| 4. | The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well.
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| 5. | The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well.
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| 6. | Above the ethmoidal crest is a narrow, horizontal groove, which forms part of the superior meatus.
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| 7. | It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus.
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| 8. | More rarely it opens on both surfaces, and then communicates with the posterior ethmoidal cells and the sphenoidal sinus.
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| 9. | In some cases the air cell opens on this surface of the bone and then communicates with the posterior ethmoidal cells.
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| 10. | There is an association of ZMC fractures with naso-orbito-ethmoidal fractures ( NOE ) on the same side as the injury.
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