How the meninges nourish the brain?

The meninges, which are the protective membranes surrounding the brain and spinal cord, play a role in nourishing the brain primarily through the cerebrospinal fluid (CSF) that circulates within the meningeal layers. This fluid not only cushions the brain but also provides essential nutrients and removes waste products. Additionally, the meninges contain blood vessels that supply oxygen and nutrients directly to the brain tissue. Together, these functions help maintain the brain's health and support its metabolic needs.