The<unk>  (from the Latin "hard mother"), or pachymeninx, is the tough and inflexible outermost of the three layers of the meninges surrounding the brain and spinal cord.  (The other two meningeal layers are the pia<unk>  and the arachnoid<unk> .) The<unk>  is not as tightly fitting around the spinal cord, extending past the spinal cord (at the second lumbar vertebra) to about the second sacral vertebra.
Dura mater
Arachnoid mater
Ependyma
Parenchyma
Ganglion
White matter
Epidural space
Subarachnoid space