Ethmoid sinus

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Bone: Ethmoid sinus
Nnh front.svg
Paranasal sinuses
Coronal section of nasal cavities.
Latin cellulae ethmoidales
Gray's subject #36 154
MeSH Ethmoid+Sinus
/ Elsevier

The ethmoid sinus, one of the paranasal sinuses, is the collective name for the ethmoidal air cells.

Each ethmoid sinus is an air-space enclosed within the ethmoid bone. The ethmoidal air cells consist of numerous thin-walled cavities situated in the ethmoidal labyrinth and completed by the frontal, maxilla, lacrimal, sphenoidal, and palatine bones.

They lie between the upper parts of the nasal cavities and the orbits, and are separated from these cavities by thin bony laminæ.

Three groups

Anatomically, ethmoidal sinuses can be classified as the anterior, middle, and posterior ethmoid sinuses.


The ethmoidal air cells are innervated by the anterior and posterior ethmoidal nerves, and the orbital branches of the pterygopalatine ganglion.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. Template:Skull

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