QS Study

Superior sagittal sinus is a dural venous sinus that occupies the upper convex, an attached margin of the falx cerebri. It allows blood to drain from the lateral aspects of anterior cerebral hemispheres to the confluence of sinuses. It is the most common type of dural venous sinus thrombosis and is potentially devastating.

Beginning

Anteriorly at the crista galli by the union of tiny meningeal veins. It receives blood from a vein in the nasal cavity, runs backward, and gradually increases in size as blood drains from veins of the brain and the DURA MATER.

Termination

Near the internal occipital protuberance by turning to one side, usually the right & becomes continuous with the right transverse sinus (usually), or left transverse sinus (sometimes).

Superior Sagittal Sinus 1

Fig: Superior Sagittal Sinus

Interior of the sinus

Presents

  • An opening of the superior cerebral veins.
  • An opening of venous lacunae, usually 3 on each side.
  • Arachnoid villi & granulations.
  • Numerous fibrous bands.

Tributaries

  • El Superior cerebral veins.
  • Parietal emissary veins.
  • Venous lacunae (3 on each side).
  • A vein from the nose.

Clinical importance

Thrombosis of the superior sagittal sinus may be caused by the spread of infection from the nose, the scalp or the dipole. Risk factors include pregnancy, dehydration, hypercoagulable states, pancreatitis.

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