title: New perspectives in the microscopic structure of human dura mater in the dorsolumbar region.
abstract: OBJECTIVE
  The object of this study was to describe the three-dimensional structure of the dura mater by use of scanning electron microscopy.
  
  
  METHODS
  Microscopic dissection of the dura mater from four fresh cadavers (aged 70, 75, 76, and 80 years) 8-12 hours after death were investigated in three different planes (longitudinal, tangential, and transverse).
  
  
  RESULTS
  The external surface of the dura mater, facing the epidural space, consisted of a network of randomly oriented fine collagen fibers. The thicker elastic fibers (2 microns in diameter) were observed on the surface of the dura. In the inner part of the dura mater, there were very fine lamellae of collagen fibers, which were bundled into thicker (4-5 microns) layers. The dura mater consisted of 78-82 layers, each layer including 8-12 very fine lamellae.
  
  
  CONCLUSIONS
  The fibers of the dura mater do not run in a longitudinal direction and are not arranged in a parallel fashion. Cytoarchitecturally the dura mater is a laminated structure built up from well-defined layers oriented concentrically around the medulla spinalis.
authors.affiliation: Department of Anesthesia, Hospital de Móstoles, Madrid, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Reina
authors.forename: M
authors.initials: M
authors.lastname: Dittmann
authors.forename: A
authors.initials: A
authors.lastname: López Garcia
authors.forename: A
authors.initials: A
authors.lastname: van Zundert
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D004388:Dura Mater / Q000648:ultrastructure*; D004824:Epidural Space; D006801:Humans; D008161:Lumbosacral Region; D008297:Male; D008855:Microscopy, Electron, Scanning; D013346:Subarachnoid Space; D016683:Supine Position