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 meninges are the connective tissue coverings of the brain and spinal cord. The outermost layer is the dura mater, a dense and tough tissue that is reduplicated to form the periosteum of the inner skull. Beneath the dura is the arachnoid, a network of loose connective tissue that lacks blood vessels.

Detailed explanation-3: -Your pia mater, the innermost layer, is a thin layer that’s held tightly-like shrink wrap-to the surface of your brain and spinal cord. Many blood vessels pass through this layer to supply your brain tissue with blood. It also helps contain cerebrospinal fluid.