Neurons, Receptors, RNA, Ganglia, Messenger - analysis, Pain Threshold - drug effects, Afferent - physiology, Serotonin - genetics, Neurogenic Inflammation - physiopathology, Nerve Fibers - physiology, Afferent - chemistry, Afferent - ultrastructure, Calcitonin Gene-Related Peptide - genetics, Serotonin Antagonists - pharmacology, Spinal - cytology, Succinat...