After a stroke, a patient has right-hemiparesis of the leg and slurred speech. Which hemisphere and lobe were likely affected?

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Multiple Choice

After a stroke, a patient has right-hemiparesis of the leg and slurred speech. Which hemisphere and lobe were likely affected?

Explanation:
Motor control is mapped in the brain so that the leg area is in the medial part of the primary motor cortex, located in the frontal lobe. A stroke affecting the left frontal lobe would produce weakness on the right side of the body, including the leg, because each hemisphere controls the opposite side. Slurred speech points to involvement of the speech production area in the dominant frontal lobe, Broca’s area, which is typically in the left inferior frontal gyrus. Putting these signs together, damage to the left frontal lobe explains both right-hemiparesis of the leg and slurred speech.

Motor control is mapped in the brain so that the leg area is in the medial part of the primary motor cortex, located in the frontal lobe. A stroke affecting the left frontal lobe would produce weakness on the right side of the body, including the leg, because each hemisphere controls the opposite side. Slurred speech points to involvement of the speech production area in the dominant frontal lobe, Broca’s area, which is typically in the left inferior frontal gyrus. Putting these signs together, damage to the left frontal lobe explains both right-hemiparesis of the leg and slurred speech.

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