Revision 20 for 'Sphenoid sinus'

All Revisions - View changeset

Sphenoid sinus

The sphenoid sinus is the most posterior paranasal sinus. It lies antero-inferior to the sella. It is important to look for the variable pneumatization of this sinus and to report the relationship with neurovascular structures. The sinus is often divided by a central septum, and in this context some radiologists employ the term sphenoid hemisinus for each portion. 

Pneumatization starts at around 2 year of age and it develops more slowly than the other paranasal sinuses.

Gross anatomy

The sphenoid sinus is formed within the body of the sphenoid bone, communicating with the roof of the nasal cavity via the spheno-ethmoidal recess in its anterior wall.

Relations
Types of pneumatization
  • conchal
  • lateral recess
  • presellar
  • sellar (which can be incomplete or complete)

Blood supply

Lymphatic drainage

Lymph drainage occurs via afferent vessels leading into the retropharyngeal nodes.

Innervation

Variant anatomy

With respect to optic nerve relationship:

  • type 1: adjacent to sphenoid sinus
  • type 2: indenting the sinus
  • type 3: traversing the sinus
  • type 4: adjacent to posterior ethmoid sinus

See also

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.