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Ethmoidal Cells
Respiratory System

Ethmoidal Cells

Cellulae ethmoideae

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The ethmoidal cells (sinuses) are small air filled spaces located between the orbits within the ethmoid bone. The number of ethmoidal cells can vary from as few as 3 to as many 18 on each side of the skull. Clinically, the cells are divided into anterior and posterior groups. The two groups are separated by the basal lamella. The cells are lined by respiratory epithelium.

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Key Features/Anatomical Relations

The ethmoidal cells are connected to the middle meatus of the nasal cavity.


The ethmoidal cells contribute to adding resonance to the voice and decreasing the overall weight of the skull.

List of Clinical Correlates

- Endoscopic sinus surgery

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Ethmoid Sinus

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When the ethmoid sinuses are completely congested, physical impedance of venous drainage occurs, resulting in soft-tissue swelling of the eyelids, maximal at the medial aspect of the lids.

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