Spinal cord and spinal nerves

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  • 1. Spinal Cord and Spinal Nerves Spinal cord anatomy and organization Spinal Plexus and Associated nerves
  • 2. Spinal Cord “Highway traveled by sensory (afferent) nerve impulses destined for brain, and by motor (efferent) nerve impulse headed for spinal nerves.”
  • 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. Spinal Cord - CNS Within spinal canal Foramen magnum to L2 Cervical enlargement Lumbar enlargement Conus medullaris Filum terminale Cauda Equina
  • 5. Spinal Cord 31 segment / nerve pairs 8 Cervical 12 Thoracic 5 Lumbar 5 Sacral 1 Coccygeal
  • 6. Nerve- bundle of nerve cells (fibers) of the PNS
  • 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. 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. Spinal Tracts Convey sensory information to the brain Transmit motor impulses from the brain to effectors Allow for integration of reflex arcs
  • 10. Rami Branches of Spinal Nerves
  • 11. Plexuses -networks of adjacent ventral rami Cervical Brachial Lumbar Sacral