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 dura mater is thick and leathery (arrows). When pulled back, the arachnoid mater deteriorates and the shiny pia mater is left visible. Between the dura mater and the skull is the epidural space.

Detailed explanation-3: -The meningeal layer of the dura mater is a durable, dense fibrous membrane that passes through the foramen magnum and is continuous with the dura mater of the spinal cord. The meningeal layer of the dura mater creates several dural folds that divide the cranial cavity into freely communicating spaces.

Detailed explanation-4: -One side of your dura attaches to your skull and the other adheres to your middle membrane layer (arachnoid mater). Your dura mater contains a drainage system, called the dural venous sinuses, which allows blood to leave your brain and allows cerebrospinal fluid to re-enter the circulation.