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Spinal cord

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Spinal cord

  1. 1. Spinal cord
  2. 2. ANATOMY OF SPINAL CORD Continuation of medulla Within the vertebral canal Upper border of atlas to lower border of L1 CONUS MEDULLARIS
  3. 3. MENINGEAL LAYERS AROUND THESPINAL CORD► Duramater …S2► Arachnoidmater …S2► Piamater …L1 FILUM TERMINALE Linea splendens Ligamenta denticulata
  4. 4. TRANSVERSE SECTION OF SPINAL CORD
  5. 5. SPINAL NERVES & SPINAL SEGMENTS► Gives off 31 pairs of nerves► C8 T12 L5 S5 Co1► Cervical & lumbar enlargements► CAUDA EQUINA
  6. 6. ► Does not correspond to the vertebral level► Cervical….1 segment► Upper thoracic….2 seg► Lower thoracic….3 seg► Lumbar ….T11 &T12► Sacral & Coccygeal….L1
  7. 7. INTERNAL STRUCTUREGrey matter Ventral horn cells 1.medial group 2.lateral group 3.central
  8. 8. Dorsal horn cells1.Substantia gelatinosa of Rolando2.nucleus proprius3.Clarke’s column4.Marginal zone
  9. 9. ► Intermediate zone 1.Intermediolateral 2.Intermediomedial
  10. 10. REXED’S LAMINA► 10 LAMINA I Marginal zone II SGR III, IV Nucleus proprius V Neck of dorsal grey column VI Base of dgc
  11. 11. VII Intermed grey matterVIII, IX Ventral hornX Around central canal
  12. 12. … .INTERNAL STRUCTUREWHITE MATTER Ascending tracts 1.Dorsal column tract-FG & FC 2.Spinothalamic tract-ANT & LAT 3.Spinocerebellar tract-ANT & POST 4.Spinotectal tract 5.Spino olivary
  13. 13. Descending tracts1.Corticospinal tract-ANT & LAT2.Vestibulospinal tract3.Reticulospinal4.Rubrospinal tract5.Tectospinal tract6.Olivospinal tract
  14. 14. Blood supply► Anterior spinal► 2 Posterior spinal arteries► Arteria vasa corona
  15. 15. ► Main source of blood is the Vertebral arteries……cervical► Radicular arteries…….spinal br. of vertebral, asc cervical, deep cervical, intercostal, lumbar and sacral art► Arteria radicularis magna
  16. 16. DISTRIBUTION OF BLOOD SUPPLY► Radicular art : grey & white matter► Anterior spinal : ant two-third ventral grey matter,part of dorsal grey matter,ant and lat funiculi► Posterior spinal : post one-third posterior horn and posterior funiculus
  17. 17. VENOUS DRAINAGE1.Antmed 2.Antlat 3.Postmed 4.Postlat Venous vasa corona Radicular veins Epidural plexus inter vertebral veins Regional veins
  18. 18. …….thank you

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