The Principal Motor Pathways: Corticospinal Tract
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Questions and Answers

What is the main function of the corticospinal tracts?

  • Receiving sensory and motor input
  • Coordinating motor activity and maintaining equilibrium
  • Maintaining muscle tone and controlling body movements
  • Mediating voluntary movement and integrating skilled movements (correct)

    • Where do most of the fibers of the corticospinal tracts cross to the opposite side?

  • Brainstem
  • Cerebral cortex
  • Spinal cord
  • Lower medulla (correct)

    • Which system helps to control body movements, especially gross automatic movements such as walking?

  • Cerebellar system
  • Motor cortex
  • Corticospinal tract
  • Basal ganglia system (correct)

    • What is the main function of the cerebellar system?

    <p>Coordinating motor activity and maintaining equilibrium</p> Signup and view all the answers

    Which anatomical structure do the motor fibers of the corticospinal tracts form in the lower medulla?

    <p>Pyramid</p> Signup and view all the answers

    What do the corticospinal tracts carry impulses that inhibit?

    <p>Muscle tone</p> Signup and view all the answers

    What happens when the corticospinal tract is damaged or destroyed?

    <p>Functions are reduced or lost below the level of injury</p> Signup and view all the answers

    Where does motor impairment develop when upper motor neuron systems are damaged above their crossover in the medulla?

    <p>On the opposite/contralateral side</p> Signup and view all the answers

    What occurs when there's damage to the lower motor neuron systems?

    <p>Ipsilateral weakness and paralysis with increased muscle tone and reflexes</p> Signup and view all the answers

    What changes occur in muscle tone as a result of damage to the basal ganglia system?

    <p>Increase in muscle tone</p> Signup and view all the answers

    What deficits can result from cerebellar damage?

    <p>Impaired coordination, gait, and equilibrium with decreased muscle tone</p> Signup and view all the answers

    What happens to skilled, complicated, or delicate movements when the corticospinal tract is damaged?

    <p>They are performed poorly when compared with gross movements</p> Signup and view all the answers

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