Venous connections of the cavernous sinus include all of the following except_____________?
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Answer: D. Sigmoid sinus and straight sinus
Explanation
The sigmoid and straight sinuses do not connect directly to the cavernous sinus. The sigmoid sinus drains the transverse sinus into the internal jugular vein in the posterior cranial fossa. The straight sinus collects blood from the inferior sagittal sinus and great cerebral vein posteriorly. Venous drainage of the central skull base relies on an interconnected network of dural sinuses. The cavernous sinus acts as a major hub receiving anterior facial and orbital venous blood. Posterior dural sinuses drain independently toward the internal jugular veins via the transverse and sigmoid pathways.
Recognizing normal cavernous sinus connections helps radiologists identify abnormal dural arteriovenous fistulas. Infections cannot easily reach the straight or sigmoid sinuses directly from facial vein pathways. Surgical procedures in the middle cranial fossa require careful hemostasis around the cavernous venous spaces. The inferior petrosal sinus provides a direct venous channel draining the cavernous sinus downwards. The pterygoid venous plexus connects directly to the cavernous sinus through emissary foramina in the skull. Veins in the orbit drain anteriorly and posteriorly, establishing direct venous communication with the cavernous sinus.
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