A corticospinal tract lesion on the right side would cause hypertonia on which side?

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Study for the Parkinson’s Disease Exam. Engage with detailed flashcards and multiple-choice questions, each offering hints and explanations. Prepare effectively for your exam!

Multiple Choice

A corticospinal tract lesion on the right side would cause hypertonia on which side?

Explanation:
The corticospinal tract crosses from one side to the other at the lower medulla (pyramidal decussation). Because of this crossing, a lesion on the right disrupts fibers that are destined to control the left side of the body. The resulting upper motor neuron signs—most notably increased muscle tone (hypertonia or spasticity) and increased reflexes—appear on the left side below the level of the lesion. In the very acute phase, there can be initial flaccidity, but the characteristic later hypertonia is contralateral to the lesion.

The corticospinal tract crosses from one side to the other at the lower medulla (pyramidal decussation). Because of this crossing, a lesion on the right disrupts fibers that are destined to control the left side of the body. The resulting upper motor neuron signs—most notably increased muscle tone (hypertonia or spasticity) and increased reflexes—appear on the left side below the level of the lesion. In the very acute phase, there can be initial flaccidity, but the characteristic later hypertonia is contralateral to the lesion.

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