the origins of these waves are considered as follows , p1 -- peripheral part of the brachial plexus , p2 -- the entry into the spinal cord or the dorsal column , p3 -- dorsal column nucleus or upper cervical cord , p4 -- the medial lemniscus , n 16 -- rostral brain stem or the thalamus , and n 19 -- thalamocortical projection or the cortex .
C0037925
spinal cord
C0228576
dorsal column