Describe spinal cord anatomy and function

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<p>Basic structure</p>

Basic structure

  • inferiorly from medulla through central canal, end tapers to conus medullary, roots extending are cauda equina

  • 3/4'“ diameter, shorter than vertebral column ends at L1

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<p>Basic function</p>

Basic function

  • provide structural and functional link between brain and body

    • sensory input and motor output

  • spinal reflexes

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Meninges

  • pia mater: adheres to cord

  • dura mater: tough outer

  • arachnoid mater: external to pia

  • subarachnoid: deep to arachnoid, flow of CSF

  • subdural: space between dura and arachnoid space

  • epidural: dura and vertebral space

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Gray matter

  • posterior horns: sensory/interneurons

  • anterior horns: somatic motor

  • lateral horns: autonomic

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Nuclei

  • sensory: posterior

    • somatic: blood vessels

    • visceral: skin, muscle, joints

  • motor: anterior/lateral

    • somatic: skeletal muscle (anterior)

    • autonomic: smooth muscle (lateral)