The intercavernous sinuses (Latin: sinus intercavernous) are dural venous sinuses that connect the right and left cavernous sinuses.
There are two intercavernous sinuses:
The superior intercavernous sinus is usually larger, situated in the anterior border of the diaphragma sellae. It lies in the posterior border of the diaphragma sellae.
Occasionally, one or even both intercavernous sinuses may be absent. If both sinuses coexist, they form a complete circular venous sinus.