Mr. Ray is unable to move on the left side; which hemisphere is affected?

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Multiple Choice

Mr. Ray is unable to move on the left side; which hemisphere is affected?

Explanation:
Movement is controlled by pathways that cross to the opposite side of the body. The motor fibers (corticospinal tract) cross at the level of the medulla, so the right hemisphere governs movement of the left side. If someone cannot move the left side, the dysfunction is in the right hemisphere where those motor signals originate. That’s why the right hemisphere is the sides’ controlling center for the left body. The left hemisphere would affect the right side, not the left, and neither or both hemispheres would be implicated for a unilateral deficit like this.

Movement is controlled by pathways that cross to the opposite side of the body. The motor fibers (corticospinal tract) cross at the level of the medulla, so the right hemisphere governs movement of the left side. If someone cannot move the left side, the dysfunction is in the right hemisphere where those motor signals originate. That’s why the right hemisphere is the sides’ controlling center for the left body. The left hemisphere would affect the right side, not the left, and neither or both hemispheres would be implicated for a unilateral deficit like this.

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