Definition: ethmoidal air cells; evaginations of the mucous membrane of the middle and superior meatus of the nasal cavity into the ethmoidal labyrinth forming multiple small paranasal sinuses; they are subdivided into anterior, middle and posterior ethmoidal sinuses.
See: anterior ethmoidal cells, middle ethmoidal cells, posterior ethmoidal cells
Synonym(s): cellulae ethmoidalesTA, ethmoid air cellsTA, ethmoidal cellsTA, antra ethmoidalia, ethmoidal sinuses, sinus ethmoidales
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