Examples of mGluR1α and mGluR5 labeling in perigeniculate nucleus. A, F terminal (F) contacting dendrite labeled for mGluR1α (d*). The synapse is indicated by anarrowhead. B, RSD terminal (RSD) contacting dendrite labeled for mGluR1α (d*). The synapse is indicated by anarrowhead. C, Soma labeled for mGluR1α (soma). Note the spine-like process extending from the soma (asterisk). D, RSD terminal (RSD) contacting fine-caliber dendrite (arrowhead) labeled for mGluR5 (d*). Scale bars (shown in C), 1 μm.