Photomicrographs from cresyl violet-stained coronal brain sections through the nucleus accumbens (NAC) (A), the striatum (B), and the dorsal raphe nucleus (DRN) (C), showing the tracks left by the microdialysis probes and the electrode. Two microdialysis probes were implanted simultaneously within the right NAC (2-mm-membrane long) and the right striatum (3-mm-membrane long) by stereotaxic surgery. Thereafter, a bipolar concentric electrode was lowered stereotaxically into the DRN (see Materials and Methods).Arrows indicate the tracks left by the microdialysis membrane and the tip of the electrode corresponding to the stimulation site within the DRN.