There will be 5 sequential cohorts (Groups A - E) with 3 subjects in each cohort. New patients will be enrolled into each group. No control group is included. All subjects will receive spinal cord injections of HSSC. All subjects will also be ambulatory with respiratory function greater than or equal to 50% supine and 60% seated of predicted normal and will receive bilateral injections at the C3 through C5 cervical segments. Subjects in Group E will receive bilateral injections at the L2 through L5 lumbar segments and then return approximately one-three months later to receive bilateral injections at the C3 through C5 cervical segments.