The straight sinus is formed by the union of which two channels?
- A Inferior sagittal sinus and the great cerebral vein ✓
- B Superior sagittal sinus and straight sinus tributaries
- C Superior petrosal and cavernous sinuses
- D Occipital sinus and marginal sinuses
Correct answer: A. Inferior sagittal sinus and the great cerebral vein
Explanation
The straight sinus runs in the junction of the falx cerebri and tentorium cerebelli. It is formed by the union of the inferior sagittal sinus, which lies in the free lower margin of the falx cerebri, with the great cerebral vein of Galen, and it usually drains into the left transverse sinus at the confluence. The superior sagittal sinus drains directly to the confluence and takes no part in forming the straight sinus.
Reference: Gray's Anatomy for Students, 4th ed.
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