GENERAL HISTOLOGY

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 layers are the dura, arachnoid, and pia mater. The dura is a thick fibrous layer inside the surrounding bones, and the pia clings to the surface of the brain and spinal cord.

Detailed explanation-3: -There are two subdivisions of arachnoid mater surrounding the subarachnoid space, the dorsal layer and the ventral layer.

Detailed explanation-4: -The most important function of the arachnoid mater is to house the arachnoid space. This space is created by the crisscrossing fibers called arachnoid trabeculae which connect the layer to the pia mater while creating a passageway.

Detailed explanation-5: -The subdural space is the space that potentially exists between the meningeal layer of the dura and the arachnoid mater. Similar to the epidural space, the subdural space typically exists only under pathological conditions.