335 5.1 Neuroanatomy Part 4

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shanamd2010
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131668
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335 5.1 Neuroanatomy Part 4
Updated:
2012-01-30 12:14:30
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neuroanatomy
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CDO 335
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  1. extrapyramiddal system consists of
    • all motor tracts from brain to spinal cord motor neurons except the pyramidal tracts
    • numerous relays of motor neurons between motor areas of ortex, thalamus, cerebellum, and brainstem
  2. extrapyramidal system tract
    • message begins in motor strip/precentral gyrus
    • continue to corona radiata
    • now to deep brain structures
    • this includes cerebellum, basal ganglia, thalamus, sustantia nigra
    • multiple synapses occuring
    • meet up with the pyramidal system in the brainstem or spinal cord at the lower motor neuron at the point of synapse
    • travel with pyramidal system to muscle
    • ensues smooth, coordinated movements
  3. Motor tract of Biceps Brachii
    • message initiation begins in motor strip/precentral gyrus of brain
    • pathways continues through corona radiata
    • through the internal capsule
    • through the medulla oblongata
    • decussation occurs
    • 3/4 crossed fibers go to lateral horn of spinal column
    • 1/4 not crossed fibers go to anterior horn of spinal column
    • THIS IS ALL BY WAY OF UPPER MOTOR NEURON
    • synapse occurs here
    • message travels by way of axon
    • to myoneural junction
    • to bicceps branchii muscles
    • contraction for movement of the arms occurs
    • THIS IS A LOWER MOTOR NEURON
    • THIS IS ALL A CORTICOSPINAL TRACT
  4. Extrapyramidal system of biceps brachii tract
    • message begins in motor cortex/precentral gyrus
    • continue to corona radiata
    • now to deep brain structures
    • this includes cerebellum, basal ganglia, thalamus
    • multiple synapses occuring
    • meet up with pyramidal system in the spinal column at the lower motor neuron at the point of synapse
    • travel with pyramidal system to muscle
    • ensues smooth, coordinated movements
  5. in the extrapyramidal system the only step that changes in step #
    • 6.
    • spinal column - corticospinal nerves
    • brainstem - corticobulbar nerves
  6. Posterior Cricoarytenoid Muscle tract
    • message initiation begins in motor cortex/precentral gyrus of the brain
    • pathway continues through the corona radiata
    • through the internal capsule
    • through the medulla oblongata
    • THIS IS ALL BY WAY OF UPPER MOTOR NEURON
    • synapse occurs in medulla oblongata
    • message travels by cell body by way of axon of cranial nerve X vagus
    • to myoneural junction
    • to posterior cricoarytenoid muscle
    • contraction for abduction of vocal folds occurs
    • THIS IS A LOWER MOTOR NEURON
    • THIS IS A CORTICOBULBAR TRACT
  7. cranial nerves I and II...
    • do not have a motor component
    • we will not be asked to trace
  8. extrapyramidal system of posterior cricoarytenoid muscles
    • begins in motor strip/precentral gyrus
    • continue to corona radiata
    • travels to deep brain structures
    • includes cerebellum, thalamus, basal ganglia
    • multiple synapses occuring
    • meet up with pyramidal system in the medulla at the point of synapse with the LMN
    • ensues smooth, coordinated movements

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