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Cortical stimulation mapping of phantom limb rolandic cortex. Case report
1Washington University Epilepsy Program, Department of Neurology and Neurological Surgery, St. Louis, Missouri.
Journal of Neurosurgery
|April 1, 1995
Summary
Brain plasticity after amputation shows motor cortex reorganization, expanding adjacent areas. Sensory cortex mapping revealed no significant changes, suggesting system-specific plasticity in the adult brain.
Area of Science:
- Neuroscience
- Plasticity research
- Cortical mapping
Background:
- Awake craniotomy for tumor resection requires precise functional mapping.
- Understanding brain plasticity after long-term amputation is crucial for neurological research.
Observation:
- A patient with a 24-year-old mid-humerus amputation underwent awake craniotomy for a tumor.
- Intraoperative mapping of the rolandic cortex was performed to guide safe tumor resection.
Findings:
- Motor cortex mapping revealed expanded representations for face, jaw, and shoulder.
- A small area of the precentral gyrus showed no response to stimulation.
- Somatosensory mapping evoked phantom limb sensations in the right arm and hand.
- Motor cortex reorganization occurred without loss of somatosensory representation.
Implications:
- Adult cortical plasticity may be system-specific, affecting motor but not sensory systems.
- This case challenges existing models of sensory cortex plasticity post-amputation.
- Findings highlight the dynamic nature of the human brain's functional organization.