ethmoid sinus

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Noun1.ethmoid sinus - a sinus of the meatuses of the nasal cavity (behind the bridge of the nose)
sinus - any of various air-filled cavities especially in the bones of the skull
References in periodicals archive ?
Frontal sinuses formation starts at two years old, but its pneumatization occurs only around 6-7 years old, because of the migration of the ethmoidal cell to the frontalis bone (PIGNATARY et al.
This is a posterolateral pneumatization of posterior ethmoidal cell coming into intimate relationship with optic nerve.
12] The bulla was found to be the most constant ethmoidal cell and the key area for approaching either the anterior or the posterior group of air cells.
Onodi Cell: This is a posterolateral pneumatization of posterior ethmoidal cell coming into intimate relationship with optic nerve.
In measurements at CT in adults, the average area of each ethmoidal cell is 0.