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In: Anatomy and Physiology

Patient X suffers from a stroke affecting part of the LEFT frontal lobe. This leads to...

Patient X suffers from a stroke affecting part of the LEFT frontal lobe. This leads to the patient losing partial motor control/ability in their RIGHT hand. As a potential therapy, Transcranial Magnetic Stimulation (TMS) is applied to the RIGHT hemisphere. Why is the TMS stimulation ipsilateral to the paretic hand? Why is not applied to the left hemisphere? Focus on concepts pertaining to neuroanatomy to guide your answer.

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Expert Solution

Patient X have lost the partial motor control in their right hand ,as a result of the stroke affecting part of the left frontal lobe. This has occurs due to the crossing over of the upper motor nerves to the exactly opposite part along their path that left hemisphere manages the right side of the body and right hemisphere controls the left side of the body. This crossing over mechanism is named as Decussation .The hemispheres in the brain connected through the bundles of the fibers between the hemispheres known as commissure corpus callosum. The presence of corpus callosum allow the left hemisphere of the brain controllling the right side of the body and vice versa. Thus in this case, motor activity of right side of the body(Right hand) is controlled by the left frontal lobe of cerebrum.Therefore, treatment through the transcranial magnetic stimulation (TMS) applying to right hemisphere will cause activation ipsilateral to the paretic hand .

Sydney Mullin answered 1 year ago
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