The outermost part of the spinal canal. It is the space within the canal (formed by the surrounding vertebrae) lying outside the dura mater.
Comment:
[taxon-note] "In humans the epidural space contains lymphatics, spinal nerve roots, loose fatty tissue, small arteries, and a network of large, thin-walled blood vessels called the epidural venous plexus"
Synonyms:
exact_synonym:
cavum epidurale; cavum extradurale; extradural space; spatium epidurale; spatium extradurale