The occipital sinus is the smallest of the dural venous sinuses (also known as the cranial sinuses).
The sinuses at the base of the skull. (Occipial sinus visible at bottom center, below the Foramen Magnum on image.)
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It is situated in the attached margin of the falx cerebelli, and is generally single, but occasionally there are two.
It commences around the margin of the foramen magnum by several small venous channels, one of which joins the terminal part of the transverse sinus; it communicates with the posterior internal vertebral venous plexuses and ends in the confluence of the sinuses.
Occipital sinuses were discovered by Guichard Joseph Duverney.