What are dural sinuses?

What are dural sinuses?

• A. Small arteries within the dura.
• B. Cavities within the brain where CSF is produced.
• C. Nodes of neural tissue in the meninges.
• D. Large venous channels formed between the periosteal dura and meningeal dura that collect venous blood.

Answer: (D)

Dural sinuses are large venous channels within the dura mater, formed where the two dural layers (periosteal and meningeal) split apart. They collect venous blood from the brain and also receive CSF that drains from the subarachnoid space via arachnoid granulations, with the blood ultimately draining into the internal jugular veins. This venous drainage system is distinct from arteries, which supply blood, and from cavities that produce CSF (the ventricles and choroid plexus). So they’re best described as the major venous pathways in the dura that collect brain blood and help regulate CSF drainage.

Dural sinuses are large venous channels within the dura mater, formed where the two dural layers (periosteal and meningeal) split apart. They collect venous blood from the brain and also receive CSF that drains from the subarachnoid space via arachnoid granulations, with the blood ultimately draining into the internal jugular veins. This venous drainage system is distinct from arteries, which supply blood, and from cavities that produce CSF (the ventricles and choroid plexus). So they’re best described as the major venous pathways in the dura that collect brain blood and help regulate CSF drainage.