GENERAL HISTOLOGY

Detailed explanation-1: -The fluid that flows in and around the hollow spaces of the brain and spinal cord, and between two of the meninges (the thin layers of tissue that cover and protect the brain and spinal cord).

Detailed explanation-2: -Ventricles. The ventricles make the cerebrospinal fluid (CSF) that protect and cushion the brain and spinal cord.

Detailed explanation-3: -The meninges separate three spaces called the epidural space, subarachnoid space, and the subdural space. Each of these spaces contains some important blood vessels, rupture of which can cause headache. The epidural space is a potential space located between the inner surface of the skull and the tightly adherent dura.

Detailed explanation-4: -The brain and spinal cord are surrounded by cerebrospinal fluid, which provides a mechanically stable environment for these delicate structures against the forces of gravity and sudden acceleration and deceleration.