A CLINICAL AND NEUROPHYSIOLOGICAL STUDY OF A PATIENT WITH AN EXTENSIVE TRANSECTION OF THE SPINAL-CORD SPARING ONLY A PART OF ONE ANTEROLATERAL QUADRANT

In 1976, Noordenbos and Wall studied sensory functions in a woman with a surgically verified T3 spinal cord transection which spared only a part of the left anterolateral quadrant We re-investigated this unique case 18 years after the lesion and included a comparable sensory exam ination, MRI of the spinal cord, somatosensory evoked potentials, PET- activation study during hand and foot vibration and analysis of flexio n reflex modulation during the Jendrassik manoeuvre. Our results show that the residual anterolateral quadrant contains ascending pathways c arrying a wide range of sensory information as well as descending path ways modulating flexion reflex activity at the spinal level. Moreover the changes in sensory functions and the unique pattern of cortical ac tivation suggest a functional reorganization of the connectivity betwe en the periphery and the cerebral cortex. Changes of facilitation and/ or of inhibition at different levels of the somatosensory system may a ccount for these longterm plastic changes.