The cavernous sinus communicates directly with all , except_______________?

Correct answer: D. Sigmoid and straight sinus

  • A. Inferior petrosal sinus
  • B. Pterygoid venous plexus
  • C. Veins in orbit
  • D. Sigmoid and straight sinus

Explanation

The cavernous sinus communicates with the inferior petrosal sinus, orbital veins and the pterygoid plexus through emissary veins. It does not communicate directly with the sigmoid and straight sinuses; connections occur indirectly through other dural sinuses.

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