QS Study

Features of Dural Venous Sinuses

Dural Venous Sinuses are venous spaces the wall of which is formed by dura mater. They are venous channels located intracranially between the two layers of dura mater. They can be conceptualized as trapped epidural veins. They contain venous blood that originates for the most part from the brain or cranial cavity.

Number

There 15 venous sinuses, some are paired & some unpaired.

Paired venous sinuses –

  • Cavernous sinus.
  • Superior petrosal sinus.
  • Inferior petrosal sinus.
  • Transverse sinus.
  • Sigmoid sinus.
  • Sphenoparietal sinus.
  • Petrosquamous sinus.
  • Middle meningeal sinus.

Unpaired venous sinuses (median in position)

  • Superior sagittal sinus.
  • Inferior sagittal sinus.
  • Straight sinus.
  • Occipital Sinus.
  • Anterior intercavernous sinus.
  • Posterior intercavernous sinus.
  • Basilar plexus of veins.

dural venous sinuses 1

Fig: Dural Venous Sinuses

Features of the sinuses

  • They are lined by endothelium.
  • No muscle in their walls.
  • No valves.
  • They receive venous blood from the brain, the meninges & bones of the skull.
  • CSF poured in some sinuses.

They drain the brain parenchyma, communicate with extracranial veins and ultimately merge to form the internal jugular veins. They communicate with veins outside the skull through emissary’s veins & thus maintain the pressure of Wood in the sinuses constant.

Related Study: