What is the primary function of the meninges?

The primary function of the meninges is to protect the brain and spinal cord, and one of their key roles is to contain and keep cerebrospinal fluid (CSF) inside. The meninges consist of three layers: the dura mater, arachnoid mater, and pia mater. These layers provide structural support and create a barrier that helps maintain an optimal environment for the central nervous system. The CSF, which is vital for cushioning the brain, removing waste, and providing nutrients, is enclosed within the subarachnoid space between the arachnoid mater and pia mater.

The other potential functions listed do not accurately reflect the primary role of the meninges. While regulating blood flow, supporting neuron growth, and facilitating synaptic connections are essential aspects of overall brain function, they are not directly associated with the function of the meninges. Instead, these processes involve other structures and mechanisms within the nervous system, emphasizing the distinct protective and supportive role of the meninges in housing and safeguarding CSF.