Sphenoid sinuses are found deep within the skull behind the ethmoid sinuses. They are small cavities approximately the size of a large grape. The left and right sphenoid, sit next to each other and are separated by a thin plate of bone (septum).
Sphenoid sinuses drain the mucus into the very back part of the nose through a special opening called ostium. There are critical structures such as the nerves for vision and major blood vessels that carry blood to and from the brain which lie in close proximity to the sphenoid sinuses. Therefore surgery in this area carries special risks. |
