Figure 5

c-Fos expression in brainstem sections of representative rats after injections of picrotoxin or vehicle into the SuM. Abbreviations: DR, dorsal raphe nucleus; IC, inferior colliculus; IP, interpeduncular nucleus; MnR, median raphe nucleus; PAG, periaqueductal gray; Pn, pontine nuclei; SC, superior colliculus; SuM, supramammillary nucleus; VTAp, posterior ventral tegmental area; VTg, ventral tegmental nucleus of Gudden.