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Spinal Cord

Spinal Cord. Spinal Cord. Length: 18 inches. Spinal Cord. Length: 18 inches terminates between L 1 and L 2 (at waist level) . Spinal Cord. Length: 18 inches terminates between L 1 and L 2 (at waist level) Diameter. Spinal Cord. Length: 18 inches

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Spinal Cord

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  1. Spinal Cord

  2. Spinal Cord • Length: 18 inches

  3. Spinal Cord • Length: 18 inches • terminates between L1 and L2 (at waist level)

  4. Spinal Cord • Length: 18 inches • terminates between L1 and L2 (at waist level) • Diameter

  5. Spinal Cord • Length: 18 inches • terminates between L1 and L2 (at waist level) • Diameter • ½ inch (at cervical and lumbar enlargements)

  6. Spinal Cord • Length: 18 inches • terminates between L1 and L2 (at waist level) • Diameter • ½ inch (at cervical and lumbar enlargements) • ¼ inch (thoracic region)

  7. Spinal Cord • Other Features • Conus medullaris • Cauda equina • Dural sac

  8. Protection of Spinal Cord • Vertebrae • Spinal Meninges • CSF

  9. Cross-sectional organization • Grey matter: organized into “horns” • White matter: organized into “columns” • Columns composed of • ascending tracts • descending tracts

  10. 31 spinal cord segments • each segment is associated with a pair of spinal nerves

  11. Anatomy of Nerves

  12. Ventral rami of:

  13. Ventral rami of: • C1-C5 form the cervical plexus

  14. Ventral rami of: • C1-C5 form the cervical plexus

  15. Ventral rami of: • C1-C5 form the cervical plexus • C5-T1 form the brachial plexus

  16. Ventral rami of: • C1-C5 form the cervical plexus • C5-T1 form the brachial plexus

  17. Ventral rami of: • C1-C5 form the cervical plexus • C5-T1 form the brachial plexus • T2-T12 form the intercostal nerves

  18. Ventral rami of: • C1-C5 form the cervical plexus • C5-T1 form the brachial plexus • T2-T12 form the intercostal nerves

  19. Ventral rami of: • C1-C5 form the cervical plexus • C5-T1 form the brachial plexus • T2-T12 form the intercostal nerves • T12-S4 form the lumbosacral plexus

  20. Examples of Peripheral Nerves

  21. Examples of Peripheral Nerves • Phrenic nerve

  22. Examples of Peripheral Nerves • Phrenic nerve • Emerges from the cervical plexus composed of axons from C3-C5

  23. b

  24. Examples of Peripheral Nerves • Phrenic nerve • Emerges from the cervical plexus composed of axons from C3-C5

  25. Examples of Peripheral Nerves • Phrenic nerve • Emerges from the cervical plexus composed of axons from C3-C5 • Median nerve

  26. Examples of Peripheral Nerves • Phrenic nerve • Emerges from the cervical plexus composed of axons from C3-C5 • Median nerve • From brachial plexus; axons from C6-T1

  27. Examples of Peripheral Nerves, cont’d • Femoral and Obturator nerves • From lumbar plexus; axons from L2-L4

  28. Examples of Peripheral Nerves, cont’d • Pudendal nerve

  29. Examples of Peripheral Nerves, cont’d • Pudendal nerve • From sacral plexus; axons from S2-S4

  30. Examples of Peripheral Nerves, cont’d • Pudendal nerve • From sacral plexus; axons from S2-S4

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