What is the primary function of dural folds?

• A. Help anchor brain to skull
• B. Provide a space for CSF
• C. Separate and compartmentalize the brain into regions
• D. Support arterial blood flow

Answer: (C)

Dural folds are infoldings of the dura mater that create internal partitions inside the skull. Their primary job is to partition the brain into compartments: the falx cerebri separates the two cerebral hemispheres, the tentorium cerebelli separates the cerebrum from the cerebellum, and the falx cerebelli partitions the cerebellar hemispheres. This organization helps keep brain regions in their own spaces, adds stability during movement, and provides boundaries for the dural venous sinuses that drain blood. Spaces for CSF are located in the ventricles and subarachnoid space, not within the folds themselves, and arterial blood flow is not directed by these folds.