Ethmoid sinus
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| Ethmoid sinus | |
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| Ethmoid bone from the right side. | |
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| Coronal section of nasal cavities. | |
| Gray's | subject #36 154 |
| MeSH | Ethmoid+Sinus |
An ethmoid sinus is one of the four subtypes of paranasal sinuses. Each ethmoid sinus is an air-space enclosed within the ethmoid bone.
Anatomically, ethmoidal sinuses can be classified as the anterior, middle, and posterior ethmoid sinuses.
The anterior and middle ethmoidal sinuses drain into the middle meatus of the nose. The posterior ethmoidal sinuses drain into the superior meatus.
[edit] Ethmoidal Air Cells
The Ethmoidal Air Cells (cellulæ ethmoidales) 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.
On either side they are arranged in three groups, anterior, middle, and posterior.
The anterior and middle groups open into the middle meatus of the nose, the former by way of the infundibulum, the latter on or above the bulla ethmoidalis.
The posterior cells open into the superior meatus under cover of the superior nasal concha; sometimes one or more opens into the sphenoidal sinus.
The ethmoidal air cells are innervated by the anterior and posterior ethmoidal nerves, and the orbital branches of the pterygopalatine ganglion.
[edit] 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 As such, some of the information contained herein may be outdated.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.
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