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H-reflex in nonhomonymous muscles in the human forearm

Human Motor Control Section, Medical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD.

In 6 healthy volunteers, stimulation of the median nerve at the elbow elicited H-reflexes in muscles innervated by the ulnar nerve (flexor digitorum profundus of the 4th and 5th digits of the hand) as well as the median nerve (flexor carpi radialis). This finding offers direct physiologic evidence in humans of monosynaptic excitation from group la afferents to nonhomonymous muscles, a phenomenon for which only limited indirect evidence existed previously.

Address correspondence and reprint requests to Dr. Hallett, Building 10, Room. 5N226, NINDS, NIH, Bethesda, MD 20892.

Dr. Lelli was supported in part by a grant from FIDIA S.p.A., Abano Terme, Italy.

Presented in part at the fortieth annual meeting of the American Academy of Neurology, Cincinnati, OH, April 1988.

Received July 6, 1988. Accepted for publication in final form December 21, 1988.