Space
Sphenoid sinus
A variable sinus close to the central skull base
High-yield
The opening is on the anterior sinus wall and drains into the sphenoethmoidal recess, behind and above the superior concha. The sinus is an anatomical route used in some pituitary operations.
Overview
Sphenoid air spaces develop within the sphenoid body and may extend into neighboring processes. Their size, symmetry and septa vary. A well-pneumatized sinus lies close to the sella above and the cavernous carotid and optic structures laterally.
Reference facts
- Boundaries
- Usually within the sphenoid body, below the sellar region and above the nasopharynx. Relations to the optic canal, cavernous sinus and carotid artery depend on pneumatization.
- Contents
- Respiratory-lined air spaces with a variable intersinus septum and sometimes additional septa.
- Communications
- Anterior ostium to the sphenoethmoidal recess of the nasal cavity.
- Blood supply
- Sphenopalatine/maxillary branches and posterior ethmoidal contributions.
- Innervation
- Posterior ethmoidal fibers from V1 and branches of V2.
Clinical correlation
Isolated sphenoid inflammation may cause poorly localized headache. Visual or ocular-movement abnormalities can occur when nearby optic or cavernous sinus structures are involved; a particular headache location is not diagnostic.
Frequently asked questions
What are the boundaries of the sphenoid sinus?
Usually within the sphenoid body, below the sellar region and above the nasopharynx. Relations to the optic canal, cavernous sinus and carotid artery depend on pneumatization.
What does the sphenoid sinus contain?
The sphenoid sinus contains the respiratory-lined air spaces with a variable intersinus septum and sometimes additional septa.
What does the sphenoid sinus communicate with?
Anterior ostium to the sphenoethmoidal recess of the nasal cavity.