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9 Cards in this Set
- Front
- Back
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The ______ is the most important motor pathway, involving primary motor cortex to spinal cord.
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corticospinal tract
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Approximately 85% of motor fibers cross over to control movment of the opposite side of the body at the _____ junction.
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medulla/spinal cord
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Lesions ___(above/below)___ the decussation result in contralateral weakness; lesions ___(above/below)___ the decussation result in ipsilateral weakness.
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above; below
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__(Upper/Lower)__ motor neurons project from cortex to spinal cord or brainstem.
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Upper
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__(Upper/Lower)__ motor neurons project from out of the CNS via anterior spinal roots (or cranial nerves) to reach muscle cells in the periphery.
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Lower
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The ________ and basal ganglia act by modulating the output of the corticospinal tract, and they also receive inputs from _______ and _______. They project back to motor cortex via the ________.
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cerebellum; brainstem and spinal cord; thalamus
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Lesions of the cerebellum result in ________ (disorder of coordination and balance).
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ataxia
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Lesions in the basal ganglia cause (A) hypokinetic movement disorders, (B) hyperkinetic movement disorders, or (C) both
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C - both
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Parkinsonism is an example of a ___hypokinetic/hyperkinetic___ movement disorder; Huntington disease is an example of a ___hypokinetic/hyperkinetic___ movement disorder.
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hypokinetic; hyperkinetic
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