
Involvement of serotonin 2A receptors in the analgesic effect of tramadol in mono-arthritic rats
Keywords: 5-HT, 5-hydroxytryptamine; NRM, nucleus of raphe magnus; vlPAG, ventrolateral periaqueductal gray; CFA, complete Fruends' adjuvant; PWL, paw withdrawal latencyKetanserin; Paw withdrawal latency; 5-HT2A receptor; In situ hybridization