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AAAC71  21/5/05  11:00 AM  Page 158
           71 The spine


                                                                     Transverse
                                                                     process
                                       True
                                       transverse                    Head of rib
                                       process
                                                                                             Facet for dens
                                Costal
                                element                      Spine                   Facet for  Dens
                                                                                     occipital   Position of transverse
                           Anterior                                                  condyles    ligament
                           and posterior                     Superior
                           tubercles of                      articular facet
                           transverse                        Foramen
                           process                           transversarium
                   Fig.71.1
                   A cervical vertebra.                                                                    Transverse
                   The anterior tubercles of the transverse processes                                      process
                   represent the costal elements                                                         Foramen
                                                                                                         transversarium
                                                                                                    Groove for
                  Facet                       Demifacet for rib                                     vertebral artery
                  for rib                                                                     Posterior
                                                                              Fig.71.2        tubercle
                                              Intervertebral foramen
                                                                              The upper surface of the atlas.
                  Spine
                                              Intervertebral disc
                                                                              The dotted area shows the position of the dens
                                              Body                            and the dotted line indicates the transverse
                                                                              ligament
                                              Spine
                  Lamina                      Transverse process
                                              Facet for rib
                                              Articular facet (superior)
                  Pedicle
                                              Demifacet for rib
                                                                                              Interspinous ligament
                                              Vertebral canal
                                                                                   Ligamentum
                  Fig.71.3                                                                      Supraspinous ligament
                                              Body                                 flavum
                  Thoracic vertebra.
                  The articular facets lie on                         Spine
                  the arc of a circle, thus
                  permitting rotation
                                                                                                          Intertransverse
                                                                      Superior
                                                                      articular                           ligament
                                                                      facet

                                                                      Body                            Anterior longitudinal
                                                                                                      ligament
                                            Fig.71.4                                           Intervertebral disc
                                            A lumbar vertebra.                         Posterior longitudinal ligament
                                            The direction of the articular facets  Fig.71.5
                                            does not permit rotation               The ligaments joining two adjacent vertebrae


                158 Spine and spinal cord
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