part of part of surrounds surrounds anatomical space dura mater epidural space extradural Wikipedia:Epidural_space epidural in the FMA this is treated as a space of the head, but this ontology covers non-humans, where the space may continue into the tail SCTID:281866004 The outermost part of the spinal canal. It is the space within the canal (formed by the surrounding vertebrae) lying outside the dura mater. MESH:D004824 spatium extradurale epidural cavity FMA:71228 extradural space GAID:243 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 cavum epidurale UBERON:0003691 cavum extradurale spatium epidurale vertebral canal space in vertebral column