Fig. 10.

Schematic showing major patterns of immunolabel and relationship to known pathways related to excitatory mGluRs in the LGN. Shown are two relay cells, an X cell (left) and a Y cell (right). Both cells have mGluR1α labeling on peripheral dendrites postsynaptic to cortical input. The interneuron associated with the X cell extends a dendrite that forms an F2 terminal onto the proximal dendrite of the relay cell. This F2 contact contains label for mGluR5 and is innervated by a retinal terminal that also contacts the relay cell in a triadic arrangement. The Y cell has no similar interneuron input. See text for details.