Fig. 1.

Extracellular recording of multiunit sympathetic activity in skin and muscle nerves of conscious humans. (A) from intact individual; (B) from a subject with complete spinal cord transection at C6. At arrows, the skin over the forearm was stimulated electrically. Note the absence of ongoing activity in both nerves and the synchronous activation by the stimulus after spinal cord injury. Modified from Stjernberg et al. (1986)