Space between the dura mater and the walls of the vertebral canal.
http://www.cochrane.org/fr/CD008938/lair-compare-a-la-solution-saline-dans-la-technique-de-la-perte-de-resistance-pour-lidentification-de-lespace-peridural 2014 false false false France United Kingdom French meta-analysis french abstract radiographic image enhancement identical sodium chloride air, nos diffuse rigidity saline solution air epidural space solution, nos Identification, Psychological