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*Deceased.
From the Departments of Neurosurgery (Drs Nii and Uematsu) and Neurology (Drs Lesser and Gordon) The Johns Hopkins University School of Medicine, The Zanvyl Krieger Mind/Brain Institute (Drs Lesser and Gordon), The Johns Hopkins University, Baltimore, MD, and the Department of Neurosurgery (Dr Nii), Osaka University Medical School Osaka Japan
Supported by the Tanaka Memorial Scholarship Fund provided by Mary Lorenc (Mrs Tanaka), the National Institutes of Health (Grant No 1 RO1 NS26553 from the National Institute of Neurological Disorders and Stroke), the Whittier Foundation, the Seaver Foundation, and the McDonnel-Pew Program in Cognitive Neuroscience
Received March 14, 1995 Accepted in final form June 8, 1995
Address correspondence and reprint requests to Dr Ronald P Lesser, Department of Neurology, Meyer 2-147, Johns Hopkins Medical Institutions 600 North Wolfe Street, Baltimore, Maryland, 21287-7247
To clarify the exact anatomic relationship of electrically identified hand areas to the central sulcus, we constructed cortical surface renderings of magnetic resonance images (MRI) to locate the central sulcus accurately and measured the distances of stimulated points from, the central sulcus and the Sylvian fissure.We obtained hand responses in 33 patients who underwent implantation of subdural grid electrodes for evaluation and surgical treatment of intractable epilepsy and analyzed these responses according to the presence of motor, sensory, mixed motor and sensory, and arrest responses. Hand motor responses occurred not only in the precentral gyrus but also in the postcentral gyrus, with great variability in superior-to-inferior distribution. Sensory responses also occurred in both the precentral and postcentral gyri with a distribution more ventral than that of motor responses. Mixed motor and sensory responses tended to be limited to the middle part of the central sulcus. Sites where electrical stimulation arrested simple hand repetitive voluntary movements occurred widely throughout the premotor and primary sensorimotor cortices. These data indicate a marked variability in the location of the human cortical hand area, and suggest that motor and sensory hand cortices overlap and are not divided in a simple manner by the central sulcus.
NEUROLOGY 1996,46 360-367
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