If a corticospinal tract lesion is on the left side of the brain, the hypertonia is seen on the limbs of the:

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Multiple Choice

If a corticospinal tract lesion is on the left side of the brain, the hypertonia is seen on the limbs of the:

Explanation:
Corticospinal tract fibers cross to the opposite side in the medullary pyramids, so unilateral brain lesions affect the contralateral body. A left hemisphere lesion disrupts descending motor commands to the right limbs, producing upper motor neuron signs such as hypertonia on the right side. This contralateral pattern is characteristic of motor pathway lesions above the decussation; if the lesion were below the decussation, signs would be ipsilateral. So the hypertonia appears in the right limbs.

Corticospinal tract fibers cross to the opposite side in the medullary pyramids, so unilateral brain lesions affect the contralateral body. A left hemisphere lesion disrupts descending motor commands to the right limbs, producing upper motor neuron signs such as hypertonia on the right side. This contralateral pattern is characteristic of motor pathway lesions above the decussation; if the lesion were below the decussation, signs would be ipsilateral. So the hypertonia appears in the right limbs.

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