Evaluation of the Impact of Lesions of the Motor and Proprioceptive Brain and Pan-medullary Pathways on Their Clinically and Electrophysiologically Assessed Function in Multiple Sclerosis

MRI protocol is different, a little bit longer than MRI in routine for patients. For healthy volunteer, a specific MRI for this study is done

Electrophysiology will be done during routine visits for patients and during inclusion visit to healthy volunteers