An arachnoid mater is a membrane which protects the brain and spinal cord below the dura mater and above the subarachnoid space and the pia mater.
extradual space
A collection of blood under the dura is a subdural hematoma.Subdural hematomaSubdural hematoma is the medical term meaning accumulation of blood in the space beneath the dura.
The dura mater and the arachnoid are not separated. They are the first two layers of meningeal tissue.
epidural space
the epidural space
Epidural is the medical term meaning above the dura mater, or the area between the dur mater and the vertebral body.
Between the bony vertebrae and the spinal dura mater.
The dura mater belong to the craniosacral system.
dura mater- this is the strongest outermost covering and external to it is epidural space filled with adipose and veins arachnoid mater- is a web-like middle cover and deep to it lies the subarachnoid space which is filled with CSF pia mater- is the very thin innermost covering and clings tightly to the brain and spinal cord
The meninges are the protective layers of the brain, the dura mater, arachnoid space, and the pus mater
Pia Mater, Subarachnoid Space, Arachnoid Mater, Dura Mater, Crainum/Vertebral Bodies.