Three Groups
The groups of the ethmoidal air cells:
- The posterior group (sometimes the posterior ethmoid sinus) drains into the superior meatus above the middle nasal concha; sometimes one or more opens into the sphenoidal sinus.
- The middle group (sometimes the middle ethmoid sinus) drains into the middle meatus of the nose on or above the bulla ethmoidalis.
- The anterior group (sometimes the anterior ethmoid sinus) drains into the middle meatus of the nose by way of the infundibulum.
Read more about this topic: Ethmoid Sinus
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