Benuzzi et al. find brain activity specific for disgusting scenes in the posterior cingulate cortex. Signal changes in perigenual cingulate and left anterior insula are linearly related to the perceived unpleasantness. Painful scenes selectively induce activation of left parietal foci including the parietal operculum, the postcentral gyrus, and adjacent portions of the posterior parietal cortex. Their abstract is here, and here is one figure from the paper:
Top, Cortical foci active during the observation of painful video clips. Bottom, Cortical foci active during the observation of disgusting video clips.