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01 Spinal cord (Cross section (H shaped figure (Ventral horns (Ventral…

- - - - Posterior
        
        long & narrow
      - Recieves
        the fibers of
        the posterior roots
        
        Is purely sensory in function :
        
        Their cell bodies are found in the
        Dorsal root ganglion
        ( a swelling on the posterior root)
        
        These ganglion cells are
        bipolar
        meaning
        their Axons connect with both the
        dorsal & ventral horn structures
    - - Ventral
        
        thick & broad
      - Contains cell bodies of
        
        alpha
        
        gamma &
        
        renshaw motor neurons
        
        Axons of alpha & motor neurons
        pass out into the ventral roots
        
        These fibers are
        Purely motor in function
      - Ventral horn motor neurons
        show an orderly topographical
        arrangement within the spinal cord
        
        Medially
        
        Motor neurons
        supplying
        the muscles of
        
        proximal limb
        
        trunk
        
        Laterally
        
        Motor neurons
        supplying
        the muscles of
        
        the distal limb
        
        Dorsally/
        posteriorly
        
        Motor neurons
        supplying
        the muscles that
        
        Flex the limbs
        flexors
        
        Ventrally/
        Anteriorly
        
        Motor neurons
        supplying
        the muscles that
        
        Extend the limbs
        extensors
        
        Medially- proximal limb + trunk
        
        laterally- distal limb
        
        posteriorly - flexors
        
        anteriorly - extensors
    - - Constitutes the grey matter
        ( ant & post)
        which surrounds the
        central canal
    - - Lies in between the
        dorsal & ventral horns
        
        Contains cell bodies of
        autonomic neurons
        ( sympathetic division)
        
        These only extend
        between
        T1 to L2 segment
  - - - Consists of many
        ascending & descending axons
        cut across it
    - - Lie betw the
        anterior median fissure
        &
        anterior roots
    - - Lie betw the
        anterior roots
        &
        posterior roots
    - - Lie betw the
        posterior roots
        &
        posterior median fissure
  - - - Which comes out from the
        vertebral canal as a
        peripheral spinal nerve
        via the
        intervertebral foremen