descending tracts of spinal cord (bio exam 4)

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rcrchick
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14361
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descending tracts of spinal cord (bio exam 4)
Updated:
2010-04-13 20:05:13
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exam 4 descending tracts of spinal cord
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exam 4 descending tracts of spinal cord
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  1. Origin: cerebral cortex
    -fibers cross in base of medulla
    Termination: anterior gray horn
    Function:
    precise, discrete voluntary movements
    lateral corticospinal
  2. Origin:cerebral cortex
    Termination:
    anterior gray horn
    -fibers cross in spinal cord
    Function:
    movements of axial skeleton
    Anterior corticospinal
  3. Origin:midebrain -fibers cross
    Termination:
    anterior gray horn
    Function:
    precise, discrete voluntary movements
    Rubrospinal
  4. Origin:Midbrain-fibers cross
    Termination:
    anterior gray horn
    Function:movements of head in response to auditory, visual, and cutaneous stimuli
    Tectospinal
  5. Origin:medulla- no crossing
    Termination:
    anterior gray horn
    Function:
    body tone in response to head movements for maintaining equilibrium
    Vestibulospinal
  6. Origin: medulla-no crossing
    Termination:
    anterior gray horn
    Function:
    inhibit extensor reflexes and muscle tone in axial skeleton and prozimal limb muscles
    Lateral reticulospinal
  7. Origin:Pons- no crossing
    Termination:anterior gray horn
    Function:facilitate extensor reflexes and muscle tone in axial skeleton and proximal limb muscles
    Anterior reticulospinal

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