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The Principal Motor Pathways: Corticospinal Tract

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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?

Coordinating motor activity and maintaining equilibrium (C) Signup and view all the answers

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

Pyramid (B) Signup and view all the answers

What do the corticospinal tracts carry impulses that inhibit?

Muscle tone (D) Signup and view all the answers

What happens when the corticospinal tract is damaged or destroyed?

Functions are reduced or lost below the level of injury (A) Signup and view all the answers

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

On the opposite/contralateral side (C) Signup and view all the answers

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

Ipsilateral weakness and paralysis with increased muscle tone and reflexes (C) Signup and view all the answers

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

Increase in muscle tone (D) Signup and view all the answers

What deficits can result from cerebellar damage?

Impaired coordination, gait, and equilibrium with decreased muscle tone (A) Signup and view all the answers

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

They are performed poorly when compared with gross movements (B) Signup and view all the answers