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Spinal cord and spinal nerves


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Spinal cord and spinal nerves

  1. 1. Spinal Cord and Spinal Nerves Spinal cord anatomy and organization Spinal Plexus and Associated nerves
  2. 2. Spinal Cord “Highway traveled by sensory (afferent) nerve impulses destined for brain, and by motor (efferent) nerve impulse headed for spinal nerves.”
  3. 3. Spinal Cord Protection Within bony vertebrae Covered by connective tissue Meninges – 3 Meninx layers Dura mater - “tough mother” Arachnoid – “spider – similar” Pia mater – “delicate mother”
  4. 4. Spinal Cord - CNS Within spinal canal Foramen magnum to L2 Cervical enlargement Lumbar enlargement Conus medullaris Filum terminale Cauda Equina
  5. 5. Spinal Cord 31 segment / nerve pairs 8 Cervical 12 Thoracic 5 Lumbar 5 Sacral 1 Coccygeal
  6. 6. Nerve- bundle of nerve cells (fibers) of the PNS
  7. 7. Spinal Cord / Neural Tissue Terminology White matter Composed of myelinated (myelin is reason for white color) nerve axons and associated glial cells Gray matter Unmyelinated axons, cell bodies or dendrites
  8. 8. Spinal Cord / Neural Tissue Terminology Ganglia / ganglion – group of unmyelinated nerve cell bodies of PNS Nucleus – mass of unmyelinated cell bodies and dendrites (gray matter) in CNS Tract – bundle of myelinated nerve fibers in spinal cord Ascending - sensory (afferent) – enter spinal cord posterior Descending – motor (efferent) – exit spinal cord anterior
  9. 9. Spinal Tracts Convey sensory information to the brain Transmit motor impulses from the brain to effectors Allow for integration of reflex arcs
  10. 10. Rami Branches of Spinal Nerves
  11. 11. Plexuses -networks of adjacent ventral rami Cervical Brachial Lumbar Sacral