Figure 4.

Location of microinjection sites. Upper panel: schematic representation of location of microinjection sites. Coronal sections (left) and corresponding and enlarged details of the areas of interest (right) [from²⁷, with modifications]. Distances are from the interaural line. Microinjection sites within the central portion of the laterodorsal tegmental nucleus (LDT) (n = 12) are represented by open circles. More rostral microinjection sites (n = 6) are represented by open triangles. Lower panel: microphotograph of a histological section showing site of microinjection (indicated by an arrow) into the LDT. Section shown corresponds approximately to the section at –0.12 mm from interaural line shown in the upper panel. DRN: dorsal raphe nucleus; DTg: dorsal tegmental nucleus; LDT: laterodorsal tegmental nucleus; Me5: mesencephalic trigeminal nucleus; scp: superior cerebellar peduncle; vlPAG: ventrolateral periaqueductal gray. Calibration bar, 500 mm.