The cavernous sinus was also opened.
"Anomalies and Curiosities of Medicine" by George M. Gould
The transverse (lateral), superior sagittal (longitudinal), and cavernous sinuses are those most frequently damaged.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
Circular sinus which connects the two cavernous sinuses together.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4" by Various