Schematic representation of FluoroGold injection sites into left parabrachial nuclei (A) or right thalamic nuclei (B) that yielded retrograde labeling in the left trigeminal dorsal horn (Paxinos and Watson atlas, with permission). Abbreviations: scp = superior cerebellar peduncle, MPB = medial parabrachial nucleus, LPBE = lateral parabrachial nucleus, external, MPBE = medial parabrachial nucleus, external. LDVL = laterodorsal thalamic nuclei, ventrolateral, Po = posterior thalamic nuclear group, VPM = ventral postermedial thalamic nuclei, VPL = ventrolateral posterolateral thalamic nuclei, VL = ventrolateral thalamic nuclei, VM = ventromedial thalamic nuclei. Scale bar = 1 mm