In terms of the ascending or nociceptive path, the substantia gelatinosa is the area of the spinal cord where nerve fibers synapse with substance p. nerve fibers synapse using serotonin nerve fibers synapse using enkephalin nerve fibers synapse with endorphins?
1) nerve fibers synapse with substance p
2) nerve fibers synapse using serotonin
3) nerve fibers synapse using enkephalin
4) nerve fibers synapse with endorphins