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Residual function in motor cortex contralateral to amputated hand

From the Department of Neurology, Charité, Humboldt-University, Berlin, Germany.

Address correspondence to PD Dr. B.-U. Meyer, Unit for Motor Disturbances and Cortex Function, Department of Neurology, Charité, Campus Virchow-Klinikum, Augustenburger Platz 1, D-13353 Berlin, Germany.

OBJECTIVE: To investigate residual function of the motor cortex corresponding to the hand of the amputated arm (MC_amp).

METHODS: Focal transcranial magnetic stimulation (TMS) of MC_amp was performed in 10 patients 22 to 52 years after arm amputation to inhibit tonic muscle contraction in the intact hand ipsilateral to cortex stimulation.

RESULTS: In all patients, onset latency, degree, and duration of this inhibition were normal.

CONCLUSION: The presence of motor inhibition in the residual hand of amputees originating from the hand motor representation of MC_amp indicates residual cortical motor representation of the lost hand irrespective of whether the effect is mediated by commissural or ipsilateral corticospinal connections.

Key words: Magnetic cortex stimulation—Motor representation—Arm amputation

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				P A McNulty, V G Macefield, J L Taylor, and M Hallett Cortically evoked neural volleys to the human hand are increased during ischaemic block of the forearm J. Physiol., January 1, 2002; 538(1): 279 - 288. [Abstract] [Full Text] [PDF]

				P A McNulty, V G Macefield, J L Taylor, and M Hallett Cortically evoked neural volleys to the human hand are increased during ischaemic block of the forearm J. Physiol., January 1, 2002; 538(1): 279 - 288. [Abstract] [Full Text] [PDF]