BRAIN
SPINAL CORD
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Detailed explanation-1: -Three layers of membranes known as meninges protect the brain and spinal cord. The delicate inner layer is the pia mater. The middle layer is the arachnoid, a web-like structure filled with fluid that cushions the brain. The tough outer layer is called the dura mater .
Detailed explanation-2: -The meninges refers to the three membranous covering which protects the brain and the spinal cord. The three layers include the dura mater, arachnoid mater, and the pia mater.
Detailed explanation-3: -The dura mater is composed of two layers: the periosteal/endosteal layer and the meningeal layer. The dural venous sinuses are between these two layers. The dura folds to form septa that create the falx cerebri, tentorium cerebelli, falx cerebelli, and diaphragma sellae.