Ethmoid sinus

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

The ethmoid sinus is each of the two paranasal sinuses within the ethmoid bone, comprising the ethmoidal air cells and filled with air. These are divided into anterior, middle and posterior group. 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 laminae.

Contents

Three groups

The groups of the ethmoidal air cells:

  • The posterior group (sometimes the posterior ethmoid sinus) drains into the superior meatus above the middle nasal concha; sometimes one or more opens into the sphenoidal sinus.
  • The middle group (sometimes the middle ethmoid sinus) drains into the middle meatus of the nose on or above the bulla ethmoidalis.

Innervation

The ethmoidal air cells receive sensory fibers from the anterior and posterior ethmoidal nerves, and the orbital branches of the pterygopalatine ganglion, which carry the postganglionic parasympathetic nerve fibers for mucous secretion from the facial nerve.

Additional images

References

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 As such, some of the information contained within it may be outdated.


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Look at other dictionaries:

  • ethmoid sinus — also ethmoidal sinus n either of two sinuses each of which is situated in a lateral part of the ethmoid bone alongside the nose and consists of ethmoidal air cells …   Medical dictionary

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  • ethmoid sinus — noun Any of several paranasal sinuses enclosed within the ethmoid bone …   Wiktionary

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  • Ethmoid bone — Bone: Ethmoid bone Cranial bones …   Wikipedia

  • Sinus ostium — A sinus ostium (plural: sinus ostia) is the opening that connects a sinus to the nasal cavity itself. It is a tight area that tends to have a higher percentage of cilia than the surrounding mucosa. If the sinus ostium is blocked this will cause… …   Wikipedia

  • ethmoid ostium — ethmoidal ostium, ostium of ethmoidal sinus, ostium of ethmoid sinus any of various small openings connecting an ethmoidal sinus or air cell to the nasal cavity …   Medical dictionary

  • sinus ethmoidales — noun a sinus of the meatuses of the nasal cavity (behind the bridge of the nose) • Syn: ↑ethmoid sinus, ↑ethmoidal sinus • Hypernyms: ↑sinus …   Useful english dictionary

  • ethmoid sinusitis — inflammation of an ethmoid sinus; called also ethmoiditis …   Medical dictionary

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