Sphenoidal sinuses
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| Sphenoidal sinuses | |
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| Lateral wall of nasal cavity; the three nasal conchæ have been removed. (Sphenoidal sinus visible at upper right, in dark circle.) | |
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| Nose and nasal cavities. (Sphenoid sinus labeled at upper right.) | |
| Latin | sinus sphenoidales |
| Gray's | subject #223 998 |
| MeSH | Sphenoid+Sinus |
The Sphenoidal Sinuses (or sphenoid) contained within the body of the sphenoid vary in size and shape; owing to the lateral displacement of the intervening septum they are rarely symmetrical.
The following are their average measurements: vertical height, 2.2 cm.; transverse breadth, 2 cm.; antero-posterior depth, 2.2 cm.
When exceptionally large they may extend into the roots of the pterygoid processes or great wings, and may invade the basilar part of the occipital bone.
Each sinus communicates with the sphenoethmoidal recess by means of an aperture in the upper part of its anterior wall.
The mucous membrane is innervated by the posterior ethmoidal nerves, and the orbital branches of the pterygopalatine ganglion.
They are present as minute cavities at birth, but their main development takes place after puberty.
[edit] Additional images
 Horizontal section of nasal and orbital cavities. |
 Oblique section through the cavernous sinus. |
 Sagittal section of nose mouth, pharynx, and larynx. |
[edit] See also
[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 As such, some of the information contained herein may be outdated.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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