The openings to the posterior ethmoidal sinuses exist under the superior meatus.

The anterior ethmoidal cells of the ethmoidal sinus open into the front part of the infundibulum as well.

It is the location of the openings for the frontal sinus, maxillary sinus, and anterior ethmoidal sinus.

Antrochoanal polyps arise from the maxillary sinuses and are the much less common, ethmoidal polyps arise from the ethmoidal sinuses.

The posterior ethmoidal artery enters the nose via the posterior ethmoidal canal and supplies the posterior ethmoidal sinuses and enters the skull to supply the meninges.

The bone splattered, the ethmoidal sinus ruptured into the olfactory bulb, which meant Les Pruel could no longer smell anything, and the copper-pointed slug did a wing-ding puree of the cerebrum taking the top of his head off like an eggshell surrendering to compressed air.

The OA continues anteriorly, giving off the anterior ethmoidal artery which enters the nose after traversing the anterior ethmoidal canal and supplies the anterior and middle ethmoidal sinuses as well as the frontal sinus and also enters the cranium to supply the meninges.