After a cerebrovascular accident that caused damage to his brain, Iago becomes paralysed in the right side of his body. Which part of his brain was most likely damaged?

Question

BlackTom AI · Accepted Answer

To reason through this question, we first consider what functions are controlled by the brain regions and how a stroke can produce contralateral (opposite side) motor deficits.
Option 1: Parietal lobe. The parietal lobe primarily processes somatosensory information (touch, proprioception) and spatial orientation. While a lesion here can affect sensation and coordination, pure right-sided paralysis is more characteristic of motor area involvement rather than primary somatosensory areas. Therefore this option does not best explain the observed paralysis.
Option 2: Occipital lobe. The occipital lobe is the visual processing center. Damage here typically leads to visual field deficits or visual processing abnormalities, not motor paralysis. Hence this choice does not account for the motor symptoms described.
Option 3: Frontal lobe. Within the frontal lobe lies the primary motor cortex (precentral gyrus) responsible for initiating voluntary movements. A cerebrovascular accident affecting the left frontal lobe would disrupt motor control on the right side of the body due to the brain’s cross-hemispheric control of motor function. This aligns with the clinical presentation of right-sided paralysis.
Option 4: Hindbrain (medulla). The medulla contains autonomic centers and pathways for vital functions and not the primary motor output for a single body side. Lesions here can be life-threatening and cause crossed or bilateral deficits, but they are not the classic site for focal unilateral limb paralysis described in this scenario. Thus, this is less likely to explain the isolated right-sided paralysis.
In summary, the patient’s right-sided paralysis following a left brain lesion most consistently points to involvement of the left frontal lobe’s motor cortex, which is the region responsible for voluntary movement control on the opposite (right) side of the body.

After a cerebrovascular accident that caused damage to his brain, Iago becomes paralysed in the right side of his body. Which part of his brain was most likely damaged?单项选择题

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