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9 Cards in this Set

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