|Bone: Ethmoid sinus|
|Coronal section of nasal cavities.|
|Gray's||subject #36 154|
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.
Anatomically, ethmoidal sinuses can be classified as the anterior, middle, and posterior ethmoid sinuses.
- The posterior drains into the superior meatus under cover of the superior nasal concha; sometimes one or more opens into the sphenoidal sinus.
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 As such, some of the information contained herein may be outdated.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